Exhibit 12

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

	Year Ended December 31,																		Six Months Ended June 30,
													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		$	32,034		$	19,219
Interest expense on portion of rent expense representative of interest		366			350			478			427			442			442			263			263
Total Fixed Charges	$	5,922		$	15,123		$	43,208		$	49,496		$	46,158		$	38,007		$	32,297		$	19,482
Earnings:
Income before provision for income taxes and minority interest	$	84,735		$	150,727		$	296,635		$	170,380		$	141,634		$	149,785		$	108,445		$	121,260
Fixed charges		5,922			15,123			43,208			49,496			46,158			38,007			32,297			19,482
Total earnings	$	90,657		$	165,850		$	339,843		$	219,876		$	187,792		$	187,792		$	140,742		$	140,742
Ratio of earnings to fixed charges		15.3	x		11.0	x		7.9	x		4.4	x		4.1	x		4.9	x		4.4	x		7.2	x

(1) The ratio of earnings to fixed charges for the year ended December 31, 2003, and the six months ended June 30, 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.