Consolidated Statement Of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Total
Balance at Dec. 31, 2011	$ 1,331	$ 3,613,808	$ (458,281)	$ 2,335,066	$ (3,130)	$ 162,344	$ 5,651,138
Balance, shares at Dec. 31, 2011	121,856,000
Dividends declared ($0.04 per share)				(5,005)			(5,005)
Exercise of long-term incentive plan stock options and employee stock purchases		(965)	2,780	(807)			1,008
Exercise of long-term incentive plan stock options and employee stock purchases, shares	65,000
Treasury stock purchases			(56,129)				(56,129)
Treasury stock purchases, shares	(528,000)
Tax benefit related to stock-based compensation		12,938					12,938
Compensation costs:
Vested compensation awards, net	17	(17)
Vested compensation awards, net, shares	1,631,000
Compensation costs included in net income		14,831				309	15,140
Cash distributions to noncontrolling interests						(8,957)	(8,957)
Net income				214,619		6,339	220,958
Deferred hedging activity, net of tax:
Net hedge losses included in continuing operations					1,580		1,580
Balance at Mar. 31, 2012	$ 1,348	$ 3,640,595	$ (511,630)	$ 2,543,873	$ (1,550)	$ 160,035	$ 5,832,671
Balance, shares at Mar. 31, 2012	123,024,000