Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges



|                                                             |  |                          |        |                     |   |                     |  |                     |        |  |      |        |   |  |   |       
|------------------------------------------------------------ |  | ------------------------ | ------ | ------------------- | - | ------------------- |  | ------------------- | ------ |  | ---- | ------ | - |  | - | ------
|                                                             |  | Years Ended December 31,
|(in thousands, except ratio of earnings to fixed charges)    |  | 2002As restated (2)      |        | 2003As restated (2) |   | 2004As restated (2) |  | 2005As restated (2) |        |  | 2006
|Income (loss) from continuing operations before income taxes |  | $                        | 13,783 |                     | $ | 34,776              |  | $                   | 21,311 |  | $    | (4,469 | ) |  | $ | 41,531
|Fixed charges:                                               |  |                          |        |                     |   |                     |  |                     |        |  |      |        |   |  |   |       
|Interest expense (including capitalized interest)            |  |                          | 22     |                     |   | 2,886               |  |                     | 5,632  |  |      | 5,010  |   |  |   | 5,028 
|Interest relating to rental expense (1)                      |  |                          | 2,856  |                     |   | 2,141               |  |                     | 2,584  |  |      | 4,079  |   |  |   | 5,790 
|                                                             |  |                          |        |                     |   |                     |  |                     |        |  |      |        |   |  |   |       
|Total fixed charges                                          |  |                          | 2,878  |                     |   | 5,027               |  |                     | 8,216  |  |      | 9,089  |   |  |   | 10,818
|                                                             |  |                          |        |                     |   |                     |  |                     |        |  |      |        |   |  |   |       
|Earnings available for fixed charges                         |  | $                        | 16,661 |                     | $ | 39,803              |  | $                   | 29,527 |  | $    | 4,620  |   |  | $ | 52,349
|                                                             |  |                          |        |                     |   |                     |  |                     |        |  |      |        |   |  |   |       
|Ratio of earnings to fixed charges                           |  |                          | 5.79   |                     |   | 7.92                |  |                     | 3.59   |  |      | 0.51   |   |  |   | 4.84  
|                                                             |  |                          |        |                     |   |                     |  |                     |        |  |      |        |   |  |   |       

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|(1) | The representative
interest portion of rental expense was deemed to be one- third of all rental expense, except for the rental expense related to the off-balance sheet financing leases, as described in the footnotes to the financial statements included in our Annual
Report on Form 10-K for the year ended December 31, 2006 which was deemed to be all interest.
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|(2) | See Note 2, Restatement of Consolidated Financial Statements to
Consolidated Financial Statements.
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