Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,															Three  Months Ended
	2008			2009			2010			2011			2012			31-Mar-13
	($ in thousands)
Net Income (loss)		(280	)		51,997			70,682			88,138			59,353			18,589
Add: Income taxes		1,090			730			404			1,221			1,194			342
Add: Fixed charges		102,772			115,946			103,779			79,114			79,020			19,744
Less: Interest capitalized		(83	)		(105	)		(186	)		(357	)		(145	)		(35	)
Earnings		103,499			168,568			174,679			168,116			139,422			38,641
Total interest expense		97,082			110,666			98,102			73,050			73,092			18,146
Interest component of rent expense-estimated		5,607			5,175			5,491			5,707			5,783			1,564
Interest capitalized		83			105			186			357			145			35
Total fixed charges		102,772			115,946			103,779			79,114			79,020			19,744
Ratio of earnings to fixed charges (1)		1.0.x			1.5.x			1.7.x			2.1.x			1.8.x			2.0.x

⁽¹⁾  The ratio of earnings to fixed charges is defined as earnings divided by fixed charges. For purposes of this calculation, earnings represents net income plus income taxes, fixed charges, less interest capitalized. Fixed charges represents the sum of interest expense (which includes amortization of premiums, discounts and capitalized expenses related to indebtedness), and the component of rental expense that we believe to be representative of the interest factor for those amounts (one-third of rental expense).