Consolidated Statement Of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2012	$ 5,867,308	$ 1,350	$ 3,683,934	$ (510,570)	$ 2,514,640	$ 177,954
Balance, shares at Dec. 31, 2012		123,356,000
Stock Issued During Period, Shares, New Issues	10,350,000
Stock Issued During Period, Value, New Issues	1,280,916	103	1,280,813
Dividends declared ($0.04 per share)	(5,502)				(5,502)
Exercise of long-term incentive plan stock options	1,047		(791)	1,838	0
Exercise of long-term incentive plan stock options, shares		41,000
Treasury stock purchases	(19,202)			(19,202)		0
Treasury stock purchases, shares		2,232,000
Conversion of 2.875% senior convertible notes	(2)		(106,989)	106,987
Adjustments to Additional Paid in Capital, Income Tax Benefit from Conversion of Convertible Notes	22,524		22,524
Tax benefit related to stock-based compensation	1,688		1,688
Compensation costs:
Vested compensation awards, net	0	5	(5)
Vested compensation awards, net, shares		484,000
Compensation costs included in net income	17,444		17,144			300
Cash distributions to noncontrolling interests	8,885					(8,885)
Net income	108,735				100,663	8,072
Balance at Mar. 31, 2013	$ 7,266,071	$ 1,458	$ 4,898,318	$ (420,947)	$ 2,609,801	$ 177,441
Balance, shares at Mar. 31, 2013		136,463,000