Exhibit 12.1

Calculation of Ratio of Earnings to Fixed Charges

	Year Ended December 31,
	2003		2004		2005		2006		2007
	(In thousands, except ratio of earnings to fixed charges)
Income from continuing operations before income taxes
Fixed charges(1)	$	17,288	$	43,919	$	73,230	$	194,559	$	226,543
Interest expense		32		1,661		5,934		3,474		3,512
Amortization of debt issuance cost		—		253		3,318		631		601
Interest included in rental expense		350		425		632		918		899
Total fixed charges	$	382	$	2,339	$	9,884	$	5,023	$	5,012
Earnings(2)	$	17,670	$	46,258	$	83,114	$	199,582	$	231,555
Ratio of earnings to fixed charges		46.3		19.8		8.4		39.7		46.2

(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.