Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

The following table presents our
earnings to fixed charges for the periods indicated:



|                                                           |  |                         |        |   |      |   |        |      |  |   |         |  |  |      |         |   |  |   |          |  
|---------------------------------------------------------- |  | ----------------------- | ------ | - | ---- | - | ------ | ---- |  | - | ------- |  |  | ---- | ------- | - |  | - | -------- | -
|                                                           |  | Year Ended December 31, |       
|                                                           |  | 2006                    |        |   | 2007 |   |        | 2008 |  |   | 2009    |  |  | 2010 |        
|Earnings:                                                  |  |                         |        |   |      |   |        |      |  |   |         |  |  |      |         |   |  |   |          |  
|Income (loss) from continuing operations before taxes (a)  |  | $                       | 36,373 |   |      | $ | 1,545  |      |  | $ | 108,351 |  |  | $    | (43,262 | ) |  | $ | (120,413 | )
|Interest expense (b)                                       |  |                         | 29,909 |   |      |   | 44,596 |      |  |   | 42,533  |  |  |      | 44,699  |   |  |   | 59,870   |  
|Amortization of deferred financing costs and bond discount |  |                         | 3,913  |   |      |   | 3,705  |      |  |   | 2,507   |  |  |      | 2,386   |   |  |   | 4,338    |  
|Preference securities dividends requirements               |  |                         | 6,736  |   |      |   | 878    |      |  |   |        |  |  |      |        |   |  |   |         |  
|Less: Preference securities dividends requirements         |  |                         | (6,736 | ) |      |   | (878   | )    |  |   |        |  |  |      |        |   |  |   |         |  
|                                                           |  |                         |        |   |      |   |        |      |  |   |         |  |  |      |         |   |  |   |          |  
|Total earnings                                             |  | $                       | 70,195 |   |      | $ | 49,846 |      |  | $ | 153,391 |  |  | $    | 3,823   |   |  | $ | (56,205  | )
|Fixed charges:                                             |  |                         |        |   |      |   |        |      |  |   |         |  |  |      |         |   |  |   |          |  
|Interest expense (b)                                       |  | $                       | 29,909 |   |      | $ | 44,596 |      |  | $ | 42,533  |  |  | $    | 44,699  |   |  |   | 59,870   |  
|Amortization of deferred financing costs and bond discount |  |                         | 3,913  |   |      |   | 3,705  |      |  |   | 2,507   |  |  |      | 2,386   |   |  |   | 4,338    |  
|Interest element on rent expense (c)                       |  |                         | 733    |   |      |   | 810    |      |  |   | 1,011   |  |  |      | 1,245   |   |  |   | 1,277    |  
|Preference securities dividends requirements (d)           |  |                         | 6,736  |   |      |   | 878    |      |  |   |        |  |  |      |        |   |  |   |         |  
|                                                           |  |                         |        |   |      |   |        |      |  |   |         |  |  |      |         |   |  |   |          |  
|Total fixed charges                                        |  | $                       | 41,291 |   |      | $ | 49,989 |      |  | $ | 46,051  |  |  | $    | 48,330  |   |  | $ | 65,485   |  
|Ratio of earnings to fixed charges (e)                     |  |                         | 1.70   |   |      |   | 1.00   |      |  |   | 3.33    |  |  |      |        |   |  |   |         |  
|                                                           |  |                         |        |   |      |   |        |      |  |   |         |  |  |      |         |   |  |   |          |  



|(a) | For the year ended December 31, 2010, income (loss) from continuing operations before taxes includes a non-cash goodwill impairment charge of $62.8 million.
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|(b) | For the year ended December 31, 2009, interest expense includes a non-recurring non-cash charge of $7.5 million associated with a deferred loss recognized on
interest rate derivatives for which previously hedged cash flows no longer exists as a result of the repayment of the first and second lien term loans on December 23, 2009.
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|(c) | Interest on operating leases estimated to be 33% of annual rental expense.
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|(d) | Preferred partnership unit interest and dividend requirement grossed up for income taxes in deriving the pre-tax income required to pay dividends through May 11, 2007,
the cancellation date of the preferred partnership units.
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|(e) | For the years ended December 31, 2009 and 2010, earnings were insufficient by $44.5 million and $121.7 million, respectively, to cover fixed charges.
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