|                                    |   |   |    |   |   |   |    |   |   |   |    |   |   |   |    |   | Three Months        |   |
|-----------------------------------------|--------|--------|---------|--------|--------|--------|---------|--------|--------|--------|---------|--------|--------|--------|---------|--------|--------------------------|--------|
|                                    |   |   |    |   |   |   |    |   |   |   |    |   |   |   |    |   | Ended                    |   |
|                                    |   | 2005   |    |   | 2006   |   |    | 2007   |   |   | 2008    |   |   | 2009   |    |   | March 31, 2010 |   |
| Earnings                                |   |   |    |   |   |   |    |   |   |   |    |   |   |   |    |   |                     |   |
| Pre-tax      income *                   |   | $      | 130,918 |   |   | $      | 167,080 |   |   | $      | 106,386 |   |   | $      | 250,506 |   |                     | $      | (158,103 | ) |   | $ | 31,581 |   |
| Fixed      charges                      |   |   | 20,755  |   |   |   | 31,313  |   |   |   | 47,159  |   |   |   | 59,672  |   |                     |   | 80,903 |   |   |   | 21,858 |   |
| Total      Earnings                     |   | $      | 151,673 |   |   | $      | 198,393 |   |   | $      | 153,545 |   |   | $      | 310,178 |   |                     | $      | (77,200 | ) |   | $ | 53,439 |   |
|                                    |   |   |    |   |   |   |    |   |   |   |    |   |   |   |    |   |                     |   |   |   |   |   |   |   |
| Fixed      Charges                      |   |   |    |   |   |   |    |   |   |   |    |   |   |   |    |   |                     |   |   |   |   |   |   |   |
| Interest      expense                   |   | $      | 18,815  |   |   | $      | 27,984  |   |   | $      | 41,841  |   |   | $      | 52,010  |   |                     | $      | 72,423 |   |   | $ | 19,868 |   |
| Rental      Interest Factor             |   |   | 1,940   |   |   |   | 3,329   |   |   |   | 5,318   |   |   |   | 7,662   |   |                     |   | 8,480 |   |   |   | 1,990 |   |
| Total      Fixed Charges                |   | $      | 20,755  |   |   | $      | 31,313  |   |   | $      | 47,159  |   |   | $      | 59,672  |   |                     | $      | 80,903 |   |   | $ | 21,858 |   |
|                                    |   |   |    |   |   |   |    |   |   |   |    |   |   |   |    |   |                     |   |   |   |   |   |   |   |
| Ratio      of Earnings to Fixed Charges |   |   | 7.3     | x      |   |   | 6.3     | x      |   |   | 3.3     | x      |   |   | 5.2     | x      |                     |   | ** |   |   |   | 2.4 | x |

| * | Includes      cash distributions from equity affiliates and excludes equity earnings      from affiliates. Also excludes capitalized  interest. |
|---|-------------------------------------------------------------------------------------------------------------------------------------------------|

| ** | During      2009, earnings were deficient by $158,103 with respect to the coverage of      fixed charges. |
|----|-----------------------------------------------------------------------------------------------------------|

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