Exhibit 12.1

Calculation of Ratio of Earnings to Fixed Charges



|                                                     |  |                                                           |       |      |   |        |  |      |        |      |   |        |  |   |        
|---------------------------------------------------- |  | --------------------------------------------------------- | ----- | ---- | - | ------ |  | ---- | ------ | ---- | - | ------ |  | - | -------
|                                                     |  | Year Ended December 31,                                  
|                                                     |  | 2002                                                      |       | 2003 |   | 2004   |  | 2005 |        | 2006
|                                                     |  | (In thousands, except ratio of earnings to fixed charges)
|Income from continuing operation before income taxes |  | $                                                         | 4,132 |      | $ | 17,288 |  | $    | 43,919 |      | $ | 73,230 |  | $ | 194,559
|Fixed charges(1)                                     |  |                                                           |       |      |   |        |  |      |        |      |   |        |  |   |        
|Interest expense                                     |  |                                                           | 102   |      |   | 32     |  |      | 1,661  |      |   | 5,934  |  |   | 3,474  
|Amortization of debt issuance cost                   |  |                                                           |      |      |   |       |  |      | 253    |      |   | 3,318  |  |   | 631    
|Interest included in rental expense                  |  |                                                           | 365   |      |   | 350    |  |      | 425    |      |   | 632    |  |   | 918    
|Total fixed charges                                  |  | $                                                         | 467   |      | $ | 382    |  | $    | 2,339  |      | $ | 9,884  |  | $ | 5,023  
|                                                     |  |                                                           |       |      |   |        |  |      |        |      |   |        |  |   |        
|Earnings(2)                                          |  | $                                                         | 4,599 |      | $ | 17,670 |  | $    | 46,258 |      | $ | 83,114 |  | $ | 199,582
|Ratio of earnings to fixed charges                   |  |                                                           | 9.8   |      |   | 46.3   |  |      | 19.8   |      |   | 8.4    |  |   | 39.7   

---

|(1) | Fixed charges consist of interest expense on indebtedness, amortization of debt issuance costs and the estimated portion of rental expense deemed a reasonable
approximation of this interest factor.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Earnings consist of income from continuing operations before income taxes plus fixed charges.
|--- | -----------------------------------------------------------------------------------------------