| **Long-Term Debt (Details) (USD $)**                                                                                                                                                                                                                                                                  | 3 Months Ended  | 9 Months Ended |        |                              |     |        | 9 Months Ended |             |             |            |            |             |               | 9 Months Ended        |                 | 9 Months Ended  | 3 Months Ended  | 6 Months Ended  | 9 Months Ended |              |             |         |             |            |            |            |               |               |               |               |               |               |               |               |               |     |               |     |                 |     |                 |     |               |               |               |     |        |     |               |               |                 |                 |               |        |               |               |               |               |               |               |              |              | 9 Months Ended |
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| **Long Term Debt [Roll Forward]**                                                                                                                                                                                                                                                                     |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Long-term debt, beginning balance                                                                                                                                                                                                                                                                     |            |                |   | $ 8,349,521,000              |     |   |           |        |        |       |       |        | $ 575,000,000 |                  | $ 8,569,083,000 | $ 8,039,774,000 | $ 8,855,083,000 | $ 8,325,774,000 | $ 36,000,000   | $ 36,000,000 |        |    |        |       |       |       | $ 200,000,000 | $ 450,500,000 | $ 502,658,000 | $ 580,724,000 | $ 200,000,000 | $ 600,000,000 | $ 300,000,000 | $ 300,000,000 | $ 450,500,000 | [1] | $ 500,000,000 | [1] | $ 1,100,000,000 | [1] | $ 1,100,000,000 | [1] | $ 600,000,000 | $ 600,000,000 | $ 600,000,000 | [1] | $ 0    | [1] | $ 434,000,000 | $ 434,000,000 | $ 1,100,000,000 | $ 1,100,000,000 | $ 500,000,000 | $ 0    | $ 500,000,000 | $ 500,000,000 | $ 345,858,000 | $ 345,858,000 | $ 200,000,000 | $ 200,000,000 | $ 50,000,000 | $ 50,000,000 | $ 945,325,000  | $ 945,325,000 | $ 138,000,000 | $ 138,000,000 | $ 1,739,000 | $ 1,739,000 | $ 628,000 | $ 628,000 | $ 125,000,000 | $ 125,000,000 | $ 193,500,000 | $ 193,500,000 | $ 531,875,000 | [2] | $ 575,000,000 | [2] |   | $ 10,197,000 |  | $ 8,325,774,000 |  | $ 13,550,000 |  |
| Payments                                                                                                                                                                                                                                                                                              |            |                |   | (571,472,000)                |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   | (781,000) |  | (570,691,000) |  | 0 |  |
| Borrowings                                                                                                                                                                                                                                                                                            |            |                |   | 1,100,000,000                |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   | 0 |  | 1,100,000,000 |  | 0 |  |
| Long-term debt, ending balance                                                                                                                                                                                                                                                                        | 8,878,049,000   |                |   | 8,878,049,000                |     |   |           |        |        |       |       |        | 575,000,000   |                  | 8,569,083,000   | 8,039,774,000   | 8,855,083,000   | 8,325,774,000   | 36,000,000     | 36,000,000   |        |    |        |       |       |       | 200,000,000   | 450,500,000   | 502,658,000   | 580,724,000   | 200,000,000   | 600,000,000   | 300,000,000   | 300,000,000   | 450,500,000   | [1] | 500,000,000   | [1] | 1,100,000,000   | [1] | 1,100,000,000   | [1] | 600,000,000   | 600,000,000   | 600,000,000   | [1] | 0      | [1] | 434,000,000   | 434,000,000   | 1,100,000,000   | 1,100,000,000   | 500,000,000   | 0      | 500,000,000   | 500,000,000   | 345,858,000   | 345,858,000   | 200,000,000   | 200,000,000   | 50,000,000   | 50,000,000   | 945,325,000    | 945,325,000 | 138,000,000 | 138,000,000 | 1,739,000 | 1,739,000 | 628,000 | 628,000 | 125,000,000 | 125,000,000 | 193,500,000 | 193,500,000 | 531,875,000 | [2] | 575,000,000 | [2] |   | 9,416,000 |  | 8,855,083,000 |  | 13,550,000 |  |
| Less: Debt Discount                                                                                                                                                                                                                                                                                   | (23,905,000)    |                |   | (23,905,000)                 |     |   | (49,664,000)   |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Less: Current Portion                                                                                                                                                                                                                                                                                 | (596,545,000)   |                |   | (596,545,000)                |     |   | (94,016,000)   |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Outstanding                                                                                                                                                                                                                                                                                 | 8,257,599,000   |                |   | 8,257,599,000                |     |   | 8,205,841,000  |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Interest Rate (in hundredths)                                                                                                                                                                                                                                                                         | 7.87%           | [3]            |   | 7.87%                        | [3] |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   | 6.15% | [3] | 7.88% | [3] | 6.33% | [3] |
| **Senior Notes [Abstract]**                                                                                                                                                                                                                                                                           |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Outstanding                                                                                                                                                                                                                                                                                 | 8,878,049,000   |                |   | 8,878,049,000                |     |   |           |        |        |       |       |        | 575,000,000   |                  | 8,569,083,000   | 8,039,774,000   | 8,855,083,000   | 8,325,774,000   | 36,000,000     | 36,000,000   |        |    |        |       |       |       | 200,000,000   | 450,500,000   | 502,658,000   | 580,724,000   | 200,000,000   | 600,000,000   | 300,000,000   | 300,000,000   | 450,500,000   | [1] | 500,000,000   | [1] | 1,100,000,000   | [1] | 1,100,000,000   | [1] | 600,000,000   | 600,000,000   | 600,000,000   | [1] | 0      | [1] | 434,000,000   | 434,000,000   | 1,100,000,000   | 1,100,000,000   | 500,000,000   | 0      | 500,000,000   | 500,000,000   | 345,858,000   | 345,858,000   | 200,000,000   | 200,000,000   | 50,000,000   | 50,000,000   | 945,325,000    | 945,325,000 | 138,000,000 | 138,000,000 | 1,739,000 | 1,739,000 | 628,000 | 628,000 | 125,000,000 | 125,000,000 | 193,500,000 | 193,500,000 | 531,875,000 | [2] | 575,000,000 | [2] |   | 9,416,000 |  | 8,855,083,000 |  | 13,550,000 |  |
| Interest Rate (in hundredths)                                                                                                                                                                                                                                                                         |            |                |   |                         |     |   |           |        |        |       |       | 0.625%      |          |                  |            |            | 7.88%           | 7.93%           | 8.05%          | 8.05%        | 9.25%       |    | 7.125%      | 6.25%      |       | 6.25%      | 8.25%         | 7.875%        | 6.25%         | 6.25%         | 8.25%         | 8.25%         | 6.625%        | 6.625%        | 7.875%        | [1] | 7.875%        | [1] | 8.25%           | [1] | 8.25%           | [1] | 8.125%        | 8.125%        | 7.125%        | [1] | 0.00%  | [1] | 7.125%        | 7.125%        | 8.50%           | 8.50%           | 9.25%         | 0.00%  | 8.75%         | 8.75%         | 7.875%        | 7.875%        | 6.73%         | 6.73%         | 8.40%        | 8.40%        | 9.00%          | 9.00% | 7.00% | 7.00% | 6.80% | 6.80% | 7.68% | 7.68% | 7.45% | 7.45% | 7.05% | 7.05% | 3.095% | [2] | 3.175% | [2] |   |   |  |   |  |   |  |
| Aggregate principal amount of debt under registered offering                                                                                                                                                                                                                                          |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         | 500,000,000 |    | 600,000,000 |       |       |       | 500,000,000   |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  | 600,000,000 |   |  |   |  |   |  |
| Issue price expressed as a percentage of principal amount (in hundredths)                                                                                                                                                                                                                             |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         | 100.00%     | 100.00% |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Net proceeds from offering                                                                                                                                                                                                                                                                            |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         | 489,600,000 |    | 588,100,000 |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Effective interest cost (in hundredths)                                                                                                                                                                                                                                                               |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       | 10.855%       |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Aggregate principal amount agreed to be purchased                                                                                                                                                                                                                                                     |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       | 400,000,000   | 49,500,000    |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Amount of consideration for purchase of notes                                                                                                                                                                                                                                                         |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       | 446,000,000   | 54,000,000    |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Losses on early extinguishment of debt                                                                                                                                                                                                                                                                | 245,000         |                | 0      | 71,063,000                   |     | 0      |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        | 500,000    | 69,200,000 | 2,100,000  |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Debt instrument repurchase amount                                                                                                                                                                                                                                                                     |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        | 78,100,000 |       | 78,100,000 |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| **Credit Agreement [Abstract]**                                                                                                                                                                                                                                                                       |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Repayment of the outstanding principal balance, quarterly installments amount                                                                                                                                                                                                                         |            |                |   |                         |     |   |           |        |        |       |       |        |          | 14,375,000            |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| First payment date of the quarterly repayment of the outstanding principal balance                                                                                                                                                                                                                    |            |                |   |                         |     |   |           |        |        |       |       |        |          | Mar. 31,         2012 |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Interest rate margin for Base Rate borrowings, minimum (in hundredths)                                                                                                                                                                                                                                |            |                |   |                         |     |   |           |        |        |       |       |        |          | 0.875%                |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Interest rate margin for Base Rate borrowings, maximum (in hundredths)                                                                                                                                                                                                                                |            |                |   |                         |     |   |           |        |        |       |       |        |          | 2.875%                |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Interest rate margin for LIBOR borrowings, minimum (in hundredths)                                                                                                                                                                                                                                    |            |                |   |                         |     |   |           |        |        |       |       |        |          | 1.875%                |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Interest rate margin for LIBOR borrowings, maximum (in hundredths)                                                                                                                                                                                                                                    |            |                |   |                         |     |   |           |        |        |       |       |        |          | 3.875%                |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Initial pricing for LIBOR based borrowings (in hundredths)                                                                                                                                                                                                                                            |            |                |   |                         |     |   |           |        |        |       |       |        |          | 2.875%                |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Maximum permitted leverage ratio                                                                                                                                                                                                                                                                      |            |                |   |                         |     |   |           |        |        |       |       |        |          | 4.5                   |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| **Credit facilities [Abstract]**                                                                                                                                                                                                                                                                      |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Interest Rate (in hundredths)                                                                                                                                                                                                                                                                         |            |                |   |                         |     |   |           |        |        |       |       | 0.625%      |          |                  |            |            | 7.88%           | 7.93%           | 8.05%          | 8.05%        | 9.25%       |    | 7.125%      | 6.25%      |       | 6.25%      | 8.25%         | 7.875%        | 6.25%         | 6.25%         | 8.25%         | 8.25%         | 6.625%        | 6.625%        | 7.875%        | [1] | 7.875%        | [1] | 8.25%           | [1] | 8.25%           | [1] | 8.125%        | 8.125%        | 7.125%        | [1] | 0.00%  | [1] | 7.125%        | 7.125%        | 8.50%           | 8.50%           | 9.25%         | 0.00%  | 8.75%         | 8.75%         | 7.875%        | 7.875%        | 6.73%         | 6.73%         | 8.40%        | 8.40%        | 9.00%          | 9.00% | 7.00% | 7.00% | 6.80% | 6.80% | 7.68% | 7.68% | 7.45% | 7.45% | 7.05% | 7.05% | 3.095% | [2] | 3.175% | [2] |   |   |  |   |  |   |  |
| Line of credit initiation date                                                                                                                                                                                                                                                                        |            |                |   | Mar. 23,         2010        |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Line of credit facility expiration date                                                                                                                                                                                                                                                               |            |                |   | Jan.        01,         2014 |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Line of credit facility maximum borrowing capacity                                                                                                                                                                                                                                                    |            |                |   |                         |     |   |           | 40,000,000  | 190,000,000 | 20,000,000 | 20,000,000 | 750,000,000 |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Number of letters of credit                                                                                                                                                                                                                                                                           |            |                |   |                         |     |   |           | 2           |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Exercised extension of commitment                                                                                                                                                                                                                                                                     |            |                |   |                         |     |   |           | 100,000,000 |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Date that the Bank to exercise its option to extend the commitments                                                                                                                                                                                                                                   |            |                |   |                         |     |   |           | 2012-09-20  |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| **Principal payments by year [Abstract]**                                                                                                                                                                                                                                                             |            |                |   |                         |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Payments 2012 (remaining three months)                                                                                                                                                                                                                                                      | 50,470,000      |                |   | 50,470,000                   |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Payments 2013                                                                                                                                                                                                                                                                               | 560,550,000     |                |   | 560,550,000                  |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Payments 2014                                                                                                                                                                                                                                                                               | 257,916,000     |                |   | 257,916,000                  |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Payments 2015                                                                                                                                                                                                                                                                               | 808,442,000     |                |   | 808,442,000                  |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Payments 2016                                                                                                                                                                                                                                                                               | 345,466,000     |                |   | 345,466,000                  |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
| Principal Payments 2017                                                                                                                                                                                                                                                                               | $ 1,100,501,000 |                |   | $ 1,100,501,000              |     |   |           |        |        |       |       |        |          |                  |            |            |            |            |           |         |        |    |        |       |       |       |          |          |          |          |          |          |          |          |          |     |          |     |            |     |            |     |          |          |          |     |   |     |          |          |            |            |          |   |          |          |          |          |          |          |         |         |           |   |   |   |   |   |   |   |   |   |   |   |   |  |   |  |   |   |  |   |  |   |  |
|                                                                                                                                                                                                                                                                                                       |
| [1]See Note 18 – Subsequent Events.[2]Represents borrowings under the Credit Agreement with CoBank.[3]Interest rate includes amortization of debt issuance costs and debt premiums or discounts.  The interest rates at September 30, 2012 represent a weighted average of multiple issuances. |

| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the aggregate principal amount of senior notes to be purchased by the entity.
+ References
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| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the total amount of consideration for the purchase of senior notes tendered.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Date that the Bank is permitted to exercise its option to extend the commitments.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Amount extended on credit agreement.
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| X                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the issue price of the senior unsecured note expressed as a percentage of principal amount of the instrument.
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| X                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The initial pricing for LIBOR borrowings under the Credit Agreement.
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| X                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum interest rate margin for Base Rate borrowings under the Credit Agreement.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum interest rate margin for Base Rate borrowings under the Credit Agreement.
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| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum interest rate margin for LIBOR borrowings under the Credit Agreement.
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| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum interest rate margin for LIBOR borrowings under the Credit Agreement.
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| X                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum permitted leverage ratio under the Credit Agreement.
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| X                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of letters of credit which are used
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease for amounts repaid on the debt instrument for the period.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase of additional borrowings on existing and new debt instruments.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.
+ References
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| - Definition
Interest rate stated in the contractual debt agreement.
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| X                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value amount of debt instrument that was repurchased.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Date the first payment under the line of credit must be paid, in CCYY-MM-DD format.
+ References
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| - Definition
Date the credit facility terminates, in CCYY-MM-DD format.
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| - Definition
Date the credit facility first became available, in CCYY-MM-DD format.
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| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
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| - Definition
Amount of the required periodic payment applied to principal.
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| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.
+ References
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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.
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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.
+ References
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.
+ References
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| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time.
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No definition available.
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| - Definition
The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.
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No definition available.
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