Exhibit 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Quarter
	Ended
	March 31,			Years Ended December 31,
	2011			2010			2009			2008			2007			2006
(In thousands)
Earnings from continuing operations before income taxes	$	50,752		$	185,340		$	140,390		$	418,199		$	249,997		$	222,063
Add:
Interest on indebtedness		8,205			36,545			35,347			47,011			33,311			29,227
Amortization of debt expense		256			1,037			973			1,070			796			704
Portion of rents representative of the interest factor		2,406			9,472			10,109			10,636			8,383			7,547
Deduct:
Undistributed earnings from less-than-50-percent-owned entities		(23	)		(352	)		(132	)		(66	)		427			(61	)
Earnings (as defined)	$	61,596		$	232,042		$	186,687		$	476,850		$	292,914		$	259,480
Fixed charges:
Interest on indebtedness	$	8,205		$	36,545		$	35,347		$	47,011		$	33,311		$	29,227
Amortization of debt expense		256			1,037			973			1,070			796			704
Portion of rents representative of the interest factor		2,406			9,472			10,109			10,636			8,383			7,547
Total fixed charges	$	10,867		$	47,054		$	46,429		$	58,717		$	42,490		$	37,478
Ratio of earnings to fixed charges		5.7	x		4.9	x		4.0	x		8.1	x		6.9	x		6.9	x