Exhibit 12.1

Computation of Ratio of Earnings to Combined Fixed Charges and Preference Dividends

(In thousands,
except ratios)



|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|-------------------------------------------------------------------- |  | --------------------------- | ------- | --- | ----------------------- | - | ------- | ---- |  | ---- | ------- | ---- | - | ------- | ---- | - | ------- | --- |  | - | ------
|                                                                     |  | Three Months EndedMarch 31, |         |     | Years EndedDecember 31,
|                                                                     |  | 2008                        |         |     | 2007                    |   |         | 2007 |  | 2006 |         | 2005 |   |         | 2004
|Earnings                                                             |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Pre-tax (loss) income                                                |  | $                           | (88,039 | )   |                         | $ | (31,006 | )    |  | $    | 86,035  |      | $ | 189,098 |      | $ | (25,697 | )   |  | $ | 9,246 
|Fixed charges                                                        |  |                             | 31,759  |     |                         |   | 29,388  |      |  |      | 133,474 |      |   | 89,086  |      |   | 25,795  |     |  |   | 3,269 
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Total earnings                                                       |  | $                           | (56,280 | )   |                         | $ | (1,618  | )    |  | $    | 219,509 |      | $ | 278,184 |      | $ | 98      |     |  | $ | 12,515
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Fixed charges                                                        |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Interest expense and amortization of finance costs                   |  | $                           | 31,446  |     |                         | $ | 29,197  |      |  | $    | 132,264 |      | $ | 88,414  |      | $ | 25,551  |     |  | $ | 3,178 
|Rental expense representative of interest factor                     |  |                             | 313     |     |                         |   | 191     |      |  |      | 1,210   |      |   | 672     |      |   | 244     |     |  |   | 91    
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Total fixed charges                                                  |  | $                           | 31,759  |     |                         | $ | 29,388  |      |  | $    | 133,474 |      | $ | 89,086  |      | $ | 25,795  |     |  | $ | 3,269 
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Ratio of earnings to fixed charges                                   |  |                             |        | (1) |                         |   |        | (2)  |  |      | 1.6     |      |   | 3.1     |      |   |        | (3) |  |   | 3.8   
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Total fixed charges                                                  |  | $                           | 31,759  |     |                         | $ | 29,388  |      |  | $    | 133,474 |      | $ | 89,086  |      | $ | 25,795  |     |  | $ | 3,269 
|Pre-tax preferred dividend requirements                              |  |                             |        |     |                         |   |        |      |  |      |        |      |   | 352     |      |   | 680     |     |  |   | 507   
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Total fixed charges plus preference dividends                        |  | $                           | 31,759  |     |                         | $ | 29,388  |      |  | $    | 133,474 |      | $ | 89,438  |      | $ | 26,475  |     |  | $ | 3,776 
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       
|Ratio of earnings to combined fixed charges and preference dividends |  |                             |        | (1) |                         |   |        | (2)  |  |      | 1.6     |      |   | 3.1     |      |   |        | (4) |  |   | 3.3   
|                                                                     |  |                             |         |     |                         |   |         |      |  |      |         |      |   |         |      |   |         |     |  |   |       



|(1) | Due to the Companys loss for the three months ended March 31, 2008, the ratio coverage was less than 1:1. The Company would have had to generate additional earnings of
$88.0 million to achieve a coverage ratio of 1:1.
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|(2) | Due to the Companys loss for the three months ended March 31, 2007, the ratio coverage was less than 1:1. The Company would have had to generate additional earnings of
$31.0 million to achieve a coverage ratio of 1:1.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Due to the Companys loss for the year ended December 31, 2005, the ratio coverage was less than 1:1. The Company would have had to generate additional earnings of $25.7
million to achieve a coverage ratio of 1:1.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | Due to the Companys loss for the year ended December 31, 2005, the ratio coverage was less than 1:1. The Company would have had to generate additional earnings of $26.4
million to achieve a coverage ratio of 1:1.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------