Exhibit 12.1

Computation of Ratios of Earnings to Fixed Charges

(dollars in thousands)

Ratio of Earnings to Fixed Charges:

	For the Year Ended December 31,															For the Three Months Ended March 31,
	2001			2002			2003			2004			2005			2005			2006
Interest expense	$	2,319		$	10,322		$	14,849		$	16,587		$	21,124		$	4,503		$	11,047
Capitalized interest		—			—			—			—			—			—			—
Amortization of premiums, discounts and capitalized expenses related to indebtedness		185			1,031			2,375			2,032			2,372			528			2,660
Estimated interest portion of rental expense		6,961			7,378			9,518			9,653			10,576			2,644			2,644
Fixed charges	$	9,465		$	18,731		$	26,742		$	28,272		$	34,072		$	7,675		$	16,351
Income (loss) before income taxes	$	38,871		$	(18,617	)	$	1,129		$	28,944		$	13,294		$	(4,466	)	$	(11,048	)
Fixed charges		9,465			18,731			26,742			28,272			34,072			7,675			16,351
Less: interest charges capitalized		—			—			—			—			—			—			—
Amortization of capitalized interest		—			—			—			—			—			—			—
Earnings	$	48,336		$	114		$	27,871		$	57,216		$	47,366		$	3,209		$	5,303
Ratio of earnings to fixed charges		5.11	x			*		1.04	x		2.02	x		1.39	x		0.42	x		0.32	x

* Earnings were insufficient to cover fixed charges by $18,617 for the year ended December 31, 2002.