Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges and

Ratio of Earnings to Combined Fixed Charges and Preferred Unit Distributions

($ in thousands except ratios)

	Predecessor (1)
	Year Ended December 31,			Period from January 1, 2007 through July 20,			Period from July 21, 2007 through December 31,		Year Ended December 31,									Three Months Ended March 31,
	2006			2007			2007		2008			2009			2010			2011
Pre-tax income (loss) from continuing operations	$	(35,855	)	$	(26,118	)	$	13,346	$	18,066		$	(16,300	)	$	(23,589	)	$	2,704
Fixed charges:
Interest expense and amortization of debt issuance costs		1,989			1,071			5,489		26,951			51,399			48,638			9,052
Capitalized interest		670			591			—		872			—			3,802			11
Estimated interest associated with rental expense (2)		440			449			362		1,255			1,526			1,595			1,415
Total fixed charges		3,099			2,111			5,851		29,078			52,925			54,035			10,478
Preferred unit distributions		—			—			—		—			—			2,243			3,035
Total combined fixed charges and preferred unit distributions		3,099			2,111			5,851		29,078			52,925			56,278			13,513
Depreciation of capitalized interest		20			16			22		54			54			54			86
Capitalized interest		(670	)		(591	)		—		(872	)		—			(3,802	)		(11	)
Pre-tax income (loss) from continuing operations plus fixed charges	$	(33,406	)	$	(24,582	)	$	19,219	$	46,326		$	36,679		$	26,698		$	13,257
Ratio of earnings to fixed charges		—			—			3.3		1.6			—			—			1.3
Ratio of earnings to combined fixed charges and preferred unit distributions		—			—			3.3		1.6			—			—			—

(1) The historical financial information for periods prior to the contribution of the assets, liabilities and operations to us on July 20, 2007 reflects the assets, liabilities and operations of our predecessor.

(2) Calculated as one third of rent expense, which is a reasonable approximation of the interest factor.