Exhibit 12.1



Calculation of Ratios of Earnings to Fixed Charges and Combined Fixed Charges and Preferred Dividends

(In thousands, except ratios)



|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|---------------------------------------------------------- |  | ---------------------------------- | ------ | - | ----------------------- | - | ------ | ---- |  | - | ------ | - |  | ---- | ------ | ---- |  | ---- | ------ |  | - | ------- |  | - | ------ | -
|                                                           |  | Three Months Ended Ended March 31, |        |   | Year Ended December 31, |  
|                                                           |  | 2005                               |        |   | 2004                    |   |        | 2004 |  |   | 2003   |   |  | 2002 |        | 2001 |  | 2000 |       
|EARNINGS AVAILABLE FOR FIXED CHARGES:                      |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|Net income                                                 |  | $                                  | 11,261 |   |                         | $ | 13,737 |      |  | $ | 53,933 |   |  | $    | 36,612 |      |  | $    | 31,579 |  | $ | 66,226  |  | $ | 38,566 |  
|Less: Capitalized interest                                 |  |                                    | (1,143 | ) |                         |   | (426   | )    |  |   | (2,857 | ) |  |      | (353   | )    |  |      |       |  |   |        |  |   | (17    | )
|Add: Fixed charges                                         |  |                                    | 1,518  |   |                         |   | 735    |      |  |   | 4,472  |   |  |      | 1,544  |      |  |      | 1,111  |  |   | 576     |  |   | 909    |  
|Income tax expense                                         |  |                                    | 6,144  |   |                         |   | 7,727  |      |  |   | 30,337 |   |  |      | 24,562 |      |  |      | 17,763 |  |   | 37,252  |  |   | 20,858 |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|EARNINGS AVAILABLE                                         |  | $                                  | 17,780 |   |                         | $ | 21,773 |      |  | $ | 85,885 |   |  | $    | 62,365 |      |  | $    | 50,453 |  | $ | 104,054 |  | $ | 60,316 |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|FIXED CHARGES:                                             |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|Interest expense                                           |  | $                                  | 271    |   |                         | $ | 211    |      |  | $ | 1,206  |   |  | $    | 784    |      |  | $    | 762    |  | $ | 381     |  | $ | 748    |  
|Capitalized interest                                       |  |                                    | 1,143  |   |                         |   | 426    |      |  |   | 2,857  |   |  |      | 353    |      |  |      |       |  |   |        |  |   | 17     |  
|Rental expense representative of interest factor           |  |                                    | 104    |   |                         |   | 98     |      |  |   | 409    |   |  |      | 407    |      |  |      | 349    |  |   | 195     |  |   | 144    |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|TOTAL FIXED CHARGES                                        |  | $                                  | 1,518  |   |                         | $ | 735    |      |  | $ | 4,472  |   |  | $    | 1,544  |      |  | $    | 1,111  |  | $ | 576     |  | $ | 909    |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|Preferred dividends on a pre-tax basis                     |  |                                    |       |   |                         |   |       |      |  |   |       |   |  |      |       |      |  |      |       |  |   |        |  |   |       |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|TOTAL FIXED CHARGES AND PREFERRED DIVIDENDS                |  | $                                  | 1,518  |   |                         | $ | 735    |      |  | $ | 4,472  |   |  | $    | 1,544  |      |  | $    | 1,111  |  | $ | 576     |  | $ | 909    |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|RATIO OF EARNINGS TO FIXED CHARGES                         |  |                                    | 11.7   |   |                         |   | 29.6   |      |  |   | 19.2   |   |  |      | 40.4   |      |  |      | 45.4   |  |   | 180.6   |  |   | 66.4   |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |  
|RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED DIVIDENDS |  |                                    | 11.7   |   |                         |   | 29.6   |      |  |   | 19.2   |   |  |      | 40.4   |      |  |      | 45.4   |  |   | 180.6   |  |   | 66.4   |  
|                                                           |  |                                    |        |   |                         |   |        |      |  |   |        |   |  |      |        |      |  |      |        |  |   |         |  |   |        |