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 plus fixed charges. Fixed charges are defined as interest expensed, plus amortized premiums, discounts and capitalized expenses related to indebtedness, plus an estimate of the interest within rental expense. Preferred stock dividends are divided by 100% minus the effective income tax rate.

	Nine Months
	Ended September 30,			Year Ended December 31,
	2006			2005			2004			2003			2002			2001
Earnings:
Income (loss) from continuing operations before income taxes	$	70,705		$	43,703		$	26,539		$	8,190		$	4,677		$	990
Fixed charges, less preferred stock dividends		31,018			29,919			22,252			17,083			5,782			2,742
Total earnings		101,723			73,622			48,791			25,273			10,459			3,732
Fixed charges:
Interest expense, including amortized premuims, discounts and capitalized expenses related to indebtedness		28,537			27,056			18,964			14,778			5,564			2,660
Interest component of rental expense		2,481			2,863			2,219			997			218			82
Preferred stock dividends		—			—			1,069			1,308			—			—
Combined fixed charges and preferred stock dividends	$	31,018		$	29,919		$	22,252		$	17,083		$	5,782		$	2,742
Ratio of historical earnings to fixed charges and preferred stock dividends		3.28	x		2.46	x		2.19	x		1.48	x		1.81	x		1.36	x