Exhibit 12.1

Computation of Ratios of Earnings to Fixed Charges

For the purpose of calculating the ratio of earnings to fixed charges, 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.

	Three Months Ended March 31,						Year Ended December 31,
	Historical				Pro Forma				Historical
	2007		2006		2007		2006		2006		2005		2004		2003		2002
							(Dollars in thousands)
Earnings:
Income (loss) from continuing operations before income taxes	$	29,406	$	19,997	$	28,513	$	116,990	$	99,388	$	43,623	$	26,539	$	8,190	$	4,677
Fixed charges		15,545		10,045		23,798		94,202		43,728		29,919		21,183		15,775		5,782
Total earnings		44,951		30,042		52,311		211,192		143,116		73,542		47,722		23,965		10,459
Fixed charges:
Interest expense, including amortized premuims, discounts and capitalized expenses related to indebtedness		14,386		9,208		22,344		88,995		40,307		27,056		18,964		14,778		5,564
Interest component of rental expense		1,159		837		1,454		5,207		3,421		2,863		2,219		997		218
Total fixed charges	$	15,545	$	10,045	$	23,798	$	94,202	$	43,728	$	29,919	$	21,183	$	15,775	$	5,782
Ratio of historical earnings to fixed charges		2.89x		2.99x		2.20x		2.24x		3.27x		2.46x		2.25x		1.52x		1.81x