Exhibit 12

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

	Year Ended December 31,												Three Months Ended March 31,
	2000		2001		2002		2003		2004 Actual		2004 Proforma (1)		2005 Actual		2005 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		11.0x		7.9x		4.4x		4.1x		5.6x		4.9x		4.8x		4.2x

(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.