| **LONG-TERM DEBT Additional Information (Details) (USD $)**            |        | 0 Months Ended       | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                  |                       | 0 Months Ended        |        |                              | 0 Months Ended               | 3 Months Ended |                              |             |                       |             |        | 3 Months Ended |        |                       |                      | 9 Months Ended |
|------------------------------------------------------------------------|--------|----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------|-----------------------|--------|------------------------------|------------------------------|----------------|------------------------------|-------------|-----------------------|-------------|--------|----------------|--------|-----------------------|----------------------|----------------|
||
| **Debt Instrument [Line Items]**                                       |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Instrument, Interest Rate, Stated Percentage                      |   |                 | 3.25%                                                                                                                                                                                                                                                                                                                                                                                                                                           |                  |                  | 12.00% |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Instrument, Maturity Date                                         |   | May 15,         2016 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  | Feb. 15,         2018 |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Issuance Date                                                     |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            | Nov. 15,         2010 |                  |   | Feb.        08,         2008 |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Instrument, Face Amount                                           |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            | $ 115,000,000         |                  |   | $ 203,000,000                |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Instrument, Periodic Payment                                      |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   | May 15 | February 15 | November 15 | August 15 |
| 3.25% Convertible Debt, Liability Component                            |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            | 94,300,000            |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Instrument, Interest Rate, Effective Percentage                   |   |                 | 7.40%                                                                                                                                                                                                                                                                                                                                                                                                                                           |                  |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Instrument, Convertible, Terms of Conversion Feature              |   |                 | Upon conversion, the convertible notes may be settled, at our election, in shares of our common stock, cash or a combination of cash and shares of our common stock. We have initially elected a net-settlement method to satisfy our conversion obligation, which allows us to settle the principal amount of the convertible notes in cash and to settle the excess conversion value in shares, as well as cash in lieu of fractional shares. |                  |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt Issuance Percentage of Par                                        |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   | 98.572%                      |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| debt agreement amendment date                                          |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         |        | Jun. 29,         2012 |        |   |           |   |                  | May 11,         2012 |           |   |   |   |   |   |
| Line of Credit Facility, Current Borrowing Capacity                    |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         | 450,000,000 | 525,000,000           | 425,000,000 |   |           |   |                  |                 |           |   |   |   |   |   |
| Line of Credit Facility, Initiation Date                               |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           | Nov.        05,         2010 |        |                  |        |   |           |   | Apr. 30,         2010 |                 |           |   |   |   |   |   |
| Line of Credit Facility, Maximum Borrowing Capacity                    |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         |        |                  |        |   | 600,000,000    |   |                  |                 |           | 80,000,000 |   |   |   |   |
| Number of Affiliated Partnerships                                      | 21     |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Line of Credit Facility, Expiration Date                               |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         | Nov.        05,         2015 |           |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Letters of Credit Outstanding, Amount                                  |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         | 18,700,000     |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Letter of Credit Fronting Fee                                          |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         | 0.125%         |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Additional Quarterly Maintenance Fee                                   |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         | 2.50%          |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage    |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         | 0.50%          |                         |        |                  |        |   |           | 0.50%  |                  |                 |           |   |   |   |   |   |
| Line of Credit Facility, Remaining Borrowing Capacity                  |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         | 199,300,000    |                         |        |                  |        |   |           |   |                  |                 |           |   |   |   |   |   |
| Debt, Weighted Average Interest Rate                                   |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         | 4.30%          |                         |        |                  |        | 3.80%  |           | 3.50%  |                  |                 | 5.00%          |   |   |   |   |   |
| Proportionate Share of PDCM Credit Facility Maximum Borrowing Capacity |   |                 |                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |                  |   |                         |                         |           |                         |        |                  |        |   |           |   |                  |                 |           | $ 40,000,000 |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the liability component of 3.25% convertible debt which may be settled in cash upon conversion.
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| - Definition
Additional quarterly maintenance fee equivalent to the spread over Eurodollar loans
+ References
No definition available.
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debt agreement amendment date, in CCYY-MM-DD format.
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| - Definition
Date the debt instrument was issued, in CCYY-MM-DD format.
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| - Definition
Debt issued at a discount, expressed as a percentage of par
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| - Definition
Letter of Credit Fronting Fee for the period the letter of credit remains outstanding.
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| - Definition
Number of Affiliated Partnerships
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| - Definition
Proportionate share of the maximum borrowing capacity under PDCM's 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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No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.
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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
Description of the frequency of periodic payments (monthly, quarterly, annual).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest rate stated in the contractual debt agreement.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
+ References
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| - Definition
Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.
+ References
No definition available.
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| - Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.
+ 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.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.
+ References
No definition available.
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