Exhibit 7.1



COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

($ in thousands)



|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|----------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------ | - |  | ------- | - |  | ------- | -
|                                                                                                                                    |  | Years Ended December 31, |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|                                                                                                                                    |  | 2002                     |   |  | 2003    |   |  | 2004    |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Earnings:                                                                                                                           |  |                          |   |  |         |   |  |         |  
|Income from continuing operations before income taxes                                                                               |  | 307,161                  |   |  | 209,368 |   |  | 23,897  |  
|Fixed charges                                                                                                                       |  | 108,876                  |   |  | 118,133 |   |  | 166,483 |  
|Minority interest expense                                                                                                           |  |                         |   |  |        |   |  |        |  
|Amortization of capitalized interest                                                                                                |  | 24,401                   |   |  | 28,614  |   |  | 29,201  |  
|Capitalized interest                                                                                                                |  | (52,406                  | ) |  | (19,884 | ) |  | (21,452 | )
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Total adjustments                                                                                                                   |  | 80,871                   |   |  | 126,863 |   |  | 174,232 |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Earnings adjusted for fixed charges                                                                                                 |  | 388,032                  |   |  | 336,231 |   |  | 198,129 |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Fixed charges:                                                                                                                      |  |                          |   |  |         |   |  |         |  
|Interest expensed and capitalized, including amortization of capitalized expenses (other than cap interest) related to
indebtedness |  | 107,458                  |   |  | 116,914 |   |  | 164,851 |  
|Portion of rent expense representative of interest (1)                                                                              |  | 1,418                    |   |  | 1,219   |   |  | 1,632   |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Total fixed charges                                                                                                                 |  | 108,876                  |   |  | 118,133 |   |  | 166,483 |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Ratio of earnings to fixed charges                                                                                                  |  | 3.6                      |   |  | 2.8     |   |  | 1.2     |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|ESTIMATE OF INTEREST WITHIN RENTAL EXPENSE                                                                                          |  |                          |   |  |         |   |  |         |  
|Total Rent expense                                                                                                                  |  | 4,296                    |   |  | 3,694   |   |  | 4,945   |  
|Estimated percentage (based on SEC guidance)                                                                                        |  | 33                       | % |  | 33      | % |  | 33      | %
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  
|Estimated interest within rental expense                                                                                            |  | 1,418                    |   |  | 1,219   |   |  | 1,632   |  
|                                                                                                                                    |  |                          |   |  |         |   |  |         |  

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|(1) | One third of rent expense is deemed to be representative of interest.
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