Exhibit 12.1

Computation of Ratios of Earnings to Combined Fixed Charges and Preferred Stock Dividends

     For the purpose of calculating the ratio of earnings to combined fixed charges and preferred stock dividends, earnings are defined as earnings from continuing operations before income taxes less net income attributable to noncontrolling interest plus fixed charges, less preferred stock dividends. Fixed charges means the sum of the following: (a) interest expensed and capitalized, (b) amortized premiums, discounts and capitalized expenses related to indebtedness, and (c) an estimate of the interest within rental expense. For the purpose of calculating the ratio above, preferred stock dividends are divided by 100% minus the effective income tax rate.

	Nine Months			Year Ended December 31,
	Ended September 30,
	2009			2008			2007			2006			2005			2004
Earnings:
Income from continuing operations before income taxes	$	145,806		$	168,464		$	122,022		$	97,444		$	41,742		$	27,769
Less: Net income attributable to noncontrolling interest		(338	)		(604	)		(285	)		—			—			—
Fixed charges, less preferred stock dividends		57,250			81,404			78,885			43,155			28,845			19,778
Total earnings		202,718			249,264			200,622			140,599			70,587			47,547
Fixed charges:
Interest expense, including amortized premuims, discounts and capitalized expenses related to indebtedness		53,432			76,210			74,116			39,968			26,169			17,817
Interest component of rental expense		3,818			5,194			4,769			3,187			2,676			1,961
Preferred stock dividends		—			—			—			—			—			1,069
Combined fixed charges and preferred stock dividends	$	57,250		$	81,404		$	78,885		$	43,155		$	28,845		$	20,847
Ratio of earnings to combined fixed charges and preferred stock dividends		3.54	x		3.06	x		2.54	x		3.26	x		2.45	x		2.28	x