Exhibit 11

STATEMENT OF COMPUTATION OF PER SHARE EARNINGS

The following computations set forth the calculation of basic and
diluted net income per common share and common shares equivalents for the three-month periods ended March 31, 2006 and 2005:



|                                                                                    |  |                              |            |      |   |           
|----------------------------------------------------------------------------------- |  | ---------------------------- | ---------- | ---- | - | ----------
|                                                                                    |  | Three Months Ended March 31,
|                                                                                    |  | 2006                         |            | 2005
|Net income                                                                          |  | $                            | 20,137,442 |      | $ | 21,570,344
|                                                                                    |  |                              |            |      |   |           
|Weighted average number of common shares outstanding                                |  |                              | 80,301,335 |      |   | 80,165,952
|                                                                                    |  |                              |            |      |   |           
|Net income per common share - Basic                                                 |  | $                            | 0.25       |      | $ | 0.27      
|                                                                                    |  |                              |            |      |   |           
|                                                                                    | 
|                                                                                    |  | Three Months Ended March 31,
|                                                                                    |  | 2006                         |            | 2005
|Net income                                                                          |  | $                            | 20,137,442 |      | $ | 21,570,344
|                                                                                    |  |                              |            |      |   |           
|Weighted average number of common shares outstanding                                |  |                              | 80,301,335 |      |   | 80,165,952
|Common share equivalents resulting from:                                            |  |                              |            |      |   |           
|Dilutive stock options and restricted stock awards                                  |  |                              | 821,186    |      |   | 515,006   
|                                                                                    |  |                              |            |      |   |           
|Adjusted weighted average number of common and common equivalent shares outstanding |  |                              | 81,122,521 |      |   | 80,680,958
|                                                                                    |  |                              |            |      |   |           
|Net income per common share - Diluted                                               |  | $                            | 0.25       |      | $ | 0.27      
|                                                                                    |  |                              |            |      |   |