Exhibit 12

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

	Year Ended December 31,																		Three Months Ended March 31,
													2003			2003			2004			2004
	1999			2000			2001			2002			Actual			Proforma(1)			Actual			Proforma(1)
Fixed Charges:
Interest expense on indebtedness	$	5,556		$	14,773		$	42,730		$	49,069		$	45,716		$	37,565		$	12,145		$	9,605
Interest expense on portion of rent expense representative of interest		366			350			478			427			442			442			121			121
Total Fixed Charges	$	5,922		$	15,123		$	43,208		$	49,496		$	46,158		$	38,007		$	12,266		$	9,726
Earnings:
Income before provision for income taxes and minority interest	$	84,735		$	150,727		$	296,635		$	170,380		$	141,634		$	149,785		$	52,064		$	54,604
Fixed charges		5,922			15,123			43,208			49,496			46,158			38,007			12,266			9,726
Total earnings	$	90,657		$	165,850		$	339,843		$	219,876		$	187,792		$	187,792		$	64,330		$	64,330
Ratio of earnings to fixed charges		15.3	x		11.0	x		7.9	x		4.4	x		4.1	x		4.9	x		5.2	x		6.6	x

(1) The ratio of earnings to fixed charges for the year ended December 31, 2003, and the three months ended March 31, 2004, have been adjusted on a proforma basis assuming the $400.0 million of notes we issued on March 3, 2004, were outstanding since January 1, 2003, and the $249.0 million of 5.5 % Notes that we redeemed as of May 16, 2004, were not outstanding during these periods.