Exhibit 12.1

Calculation of Ratio of Earnings to Fixed Charges

	Year Ended December 31,
	2001		2002		2003		2004		2005
	(In thousands, except ratio of earnings to fixed charges)
Income from continuing operations before income taxes	$	4,837	$	4,132	$	17,288	$	43,919	$	73,230
Fixed charges(1)
Interest expense		26		102		32		1,661		5,934
Amortization of debt issuance cost		—		—		—		253		3,318
Interest included in rental expense		264		365		350		425		632
Total fixed charges	$	290	$	467	$	382	$	2,339	$	9,884
Earnings(2)	$	5,127	$	4,599	$	17,670	$	46,258	$	83,114
Ratio of earnings to fixed charges		17.7		9.8		46.3		19.8		8.4

(1) “Fixed charges” consist of interest expense on indebtedness, amortization of debt issuance costs and the estimated portion of rental expense deemed a reasonable approximation of this interest factor.

(2) “Earnings” consist of income from continuing operations before income taxes plus fixed charges.