Consolidated Statements of Changes in Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests
Balance at Dec. 31, 2010	$ 2,342,715	$ 176	$ 144,855	$ 2,260,581	$ (84,757)		$ 21,860
Balance (in shares) at Dec. 31, 2010		176,000,000
Increase (Decrease) In Shareholders' Equity
Net income	528,842			524,191			4,651
Other comprehensive income	(34,825)				(35,300)		475
Purchase of non-controlling interest	(24,854)		(15,962)				(8,892)
Distributions to shareholders of noncontrolling interests	(5,077)						(5,077)
Purchase of treasury stock	(672,191)					(672,191)
Retirement of treasury stock		(13)		(672,178)		672,191
Retirement of treasury stock (in shares)		(13,000,000)
Stock options exercised, including tax benefit	31,594		31,594
Dividends declared ($0.61, $0.42 and $0.06 per common share) for the year ended December 31, 2013, 2012 and 2011, respectively	(10,097)			(10,097)
Stock-based compensation	28,679		28,679
Balance at Dec. 31, 2011	2,184,786	163	189,166	2,102,497	(120,057)		13,017
Balance (in shares) at Dec. 31, 2011		163,000,000
Increase (Decrease) In Shareholders' Equity
Net income	559,508			555,317			4,191
Other comprehensive income	3,274				3,053		221
Distributions to shareholders of noncontrolling interests	(5,206)						(5,206)
Purchase of treasury stock	(380,023)					(380,023)
Retirement of treasury stock		(6)		(380,017)		380,023
Retirement of treasury stock (in shares)		(6,000,000)
Stock options exercised, including tax benefit	116,108	3	116,105
Stock options exercised, including tax benefit (in shares)		3,000,000
Dividends declared ($0.61, $0.42 and $0.06 per common share) for the year ended December 31, 2013, 2012 and 2011, respectively	(67,677)			(67,677)
Stock-based compensation	31,412		31,412
Balance at Dec. 31, 2012	2,442,182	160	336,683	2,210,120	(117,004)		12,223
Balance (in shares) at Dec. 31, 2012	159,857,738	160,000,000
Increase (Decrease) In Shareholders' Equity
Net income	638,749			635,672			3,077
Other comprehensive income	62,196				61,765		431
Purchase of non-controlling interest			662		288		(950)
Acquisitions resulting in noncontrolling interests	10,153						10,153
Distributions to shareholders of noncontrolling interests	(4,371)						(4,371)
Purchase of treasury stock	(324,655)					(324,655)
Retirement of treasury stock		(4)		(324,651)		324,655
Retirement of treasury stock (in shares)		(4,000,000)
Stock options exercised, including tax benefit	116,517	2	116,515
Stock options exercised, including tax benefit (in shares)		2,000,000
Dividends declared ($0.61, $0.42 and $0.06 per common share) for the year ended December 31, 2013, 2012 and 2011, respectively	(96,769)			(96,769)
Stock-based compensation	36,070		36,070
Balance at Dec. 31, 2013	$ 2,880,072	$ 158	$ 489,930	$ 2,424,372	$ (54,951)		$ 20,563
Balance (in shares) at Dec. 31, 2013	158,206,118	158,000,000