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Exhibit 12.1

Ratio of Earnings to Fixed Charges(1)
(in thousands, except ratios)

			Years Ended December 31,										Three Months Ended March 31,
			1997		1998		1999		2000		2001		2001		2002
Income (loss) before taxes			(15,424	)	21,900		45,606		69,347		161,604		33,087		45,651
Fixed charges:
	Interest expense and amortization of original issue discount on all indebtedness		917		630		6,058		7,053		7,304		1,799		1,881
	Preferred stock dividends		696		—		—		—		—		—		—
	Interest included in rent expense		557		600		632		889		1,120		266		363
Total fixed charges			2,170		1,230		6,690		7,942		8,424		2,065		2,244
Income (loss) before tax provision and fixed charges			(13,254	)	23,130		52,296		77,289		170,028		35,152		47,895
Ratio of earnings to fixed charges			n/a		18.8		7.82		9.73		20.18		17.02		21.34

(1)

The ratio of earnings to fixed charges was computed by dividing earnings (income before taxes, adjusted for fixed charges) by fixed charges for the periods indicated. Fixed charges include (i) interest expense and amortization of original issue discount on all indebtedness, (ii) preferred stock dividends and (iii) a reasonable approximation of the interest factor deemed to be included in rental expense. Earnings were not sufficient to cover fixed charges for the year ended December 31, 1997 by $13.3 million.

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Ratio of Earnings to Fixed Charges(1) (in thousands, except ratios)