Exhibit 12

Computation of Ratio of Earnings to Fixed Charges
(dollars in thousands)
(unaudited)

	Year Ended December 31,																		Three Months Ended March 31,
													2004			2004			2005			2005
	2000			2001			2002			2003			Actual			Proforma (1)			Actual			Proforma (1)
Fixed Charges:
Interest expense on indebtedness	$	14,773		$	42,730		$	49,069		$	45,716		$	46,207		$	52,644		$	11,016		$	12,625
Interest expense on portion of rent expense representative of interest		350			478			427			442			558			558			171			171
Total Fixed Charges	$	15,123		$	43,208		$	49,496		$	46,158		$	46,765		$	53,202		$	11,187		$	12,796
Earnings:
Income before provision for income taxes and minority interest	$	150,727		$	296,635		$	170,380		$	141,634		$	216,568		$	210,131		$	42,634		$	41,025
Fixed charges		15,123			43,208			49,496			46,158			46,765			53,202			11,187			12,796
Total earnings	$	165,850		$	339,843		$	219,876		$	187,792		$	263,333		$	263,333		$	53,821		$	53,821
Ratio of earnings to fixed charges		11.0	x		7.9	x		4.4	x		4.1	x		5.6	x		4.9	x		4.8	x		4.2	x

(1) The ratio of earnings to fixed charges for the year ended December 31, 2004, and the three months ended March 31, 2005, have been adjusted on a proforma basis assuming the $350.0 million of 1.5% Notes were outstanding since January 1, 2004.