----

|                                                                              |   | Nine                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |
|-----------------------------------------------------------------------------------|--------|-------------------------------------|---------|--------|------------------------------------------------------------------------|--------|---------|--------|--------|--------|---------|--------|--------|--------|---------|--------|--------|--------|
|                                                                              |   | Months                  Ended       |    |   | Year                  Ended December 31,      |   |
|                                                                              |   | September                  30, 2007 |    |   | 2006                                                                   |   |    | 2005   |   |   | 2004    |   |   | 2003   |    |   | 2002   |   |
| Fixed                  charges, as defined by the Securities and Exchange         |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |
| Commission:                                                                       |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |
| Interest                  on long-term debt                                       |   | $                                   | 37,797  |   |                                                                   | $      | 51,069  |   |   | $      | 49,102  |   |   | $      | 49,015  |   |   | $      | 59,013 |   |   | $ | 56,409 |   |
| Amortization                  of debt premium, discount and expenses              |   |                                | 3,467   |   |                                                                   |   | 2,871   |   |   |   | 2,856   |   |   |   | 3,035   |   |   |   | 2,958 |   |   |   | 2,302 |   |
| Other                  interest                                                   |   |                                | 7,580   |   |                                                                   |   | 4,842   |   |   |   | 2,575   |   |   |   | 1,719   |   |   |   | 3,860 |   |   |   | 3,173 |   |
| Estimated                  interest factor of lease rental charges                |   |                                | 13,358  |   |                                                                   |   | 16,927  |   |   |   | 17,663  |   |   |   | 17,180  |   |   |   | 17,890 |   |   |   | 22,290 |   |
| Interest                  capitalized                                             |   |                                | 3,410   |   |                                                                   |   | 1,946   |   |   |   | 1,054   |   |   |   | 752     |   |   |   | 909 |   |   |   | - |   |
|      Total                  Fixed Charges                |   |                                | 65,612  |   |                                                                   |   | 77,655  |   |   |   | 73,250  |   |   |   | 71,701  |   |   |   | 84,630 |   |   |   | 84,174 |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Preferred                  dividend requirements                                  |   |                                | 635     |   |                                                                   |   | 826     |   |   |   | 788     |   |   |   | 903     |   |   |   | 774 |   |   |   | 905 |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Total                  Fixed Charges and Preferred Dividend Requirements          |   | $                                   | 66,247  |   |                                                                   | $      | 78,481  |   |   | $      | 74,038  |   |   | $      | 72,604  |   |   | $      | 85,404 |   |   | $ | 85,079 |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Earnings,                  as defined by the Securities and Exchange              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Commission:                                                                       |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Earnings                  before income taxes                                     |   | $                                   | 42,213  |   |                                                                   | $      | 110,955 |   |   | $      | 77,118  |   |   | $      | 143,839 |   |   | $      | 89,272 |   |   | $ | 93,790 |   |
| Fixed                  charges as above                                           |   |                                | 65,612  |   |                                                                   |   | 77,655  |   |   |   | 73,250  |   |   |   | 71,701  |   |   |   | 84,630 |   |   |   | 84,174 |   |
| Interest                  capitalized                                             |   |                                | (3,410  | )      |                                                                   |   | (1,946  | )      |   |   | (1,054  | )      |   |   | (752    | )      |   |   | (909 | ) |   |   | - |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Earnings                  Available for Fixed Charges                             |   | $                                   | 104,415 |   |                                                                   | $      | 186,664 |   |   | $      | 149,314 |   |   | $      | 214,788 |   |   | $      | 172,993 |   |   | $ | 177,964 |   |
|                                                                              |   |                                |    |   |                                                                   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |   |   |   |   |
| Ratio                  of Earnings to Fixed Charges and Preferred Stock Dividends |   |                                | 1.58    |   |                                                                   |   | 2.38    |   |   |   | 2.02    |   |   |   | 2.96    |   |   |   | 2.03 |   |   |   | 2.09 |   |