CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock, at Cost	Non-controlling Interests
Balance, value at Dec. 31, 2011	$ 3,714,999	$ 2,146	$ 2,347,518	$ 4,263,599	$ (8,067)	$ (2,912,324)	$ 22,127
Balance, shares at Dec. 31, 2011		157,420
Net income	354,988			336,823			18,165
Other comprehensive loss, net of tax	(302)				(302)
Dividends declared	(54,115)			(54,115)
Distributions to noncontrolling interests	(15,795)						(15,795)
Issuance of common stock under benefit plans, value	10,113	8	1,523			8,582
Issuance of common stock under benefit plans, shares		996
Stock-based compensation expense	34,178		32,393			1,785
Exercise of stock options, value	90,579		(8,845)			99,424
Exercise of stock options, shares		1,950
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(19,724)	(3)	(19,721)
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, shares		(342)
Tax benefits associated with stock-based compensation plans	4,780		4,780
Purchases of treasury stock, value	(100,000)					(100,000)
Purchases of treasury stock, shares	(1,700)	(1,729)
Other	1,434						1,434
Balance, value at Jun. 30, 2012	4,021,135	2,151	2,357,648	4,546,307	(8,369)	(2,902,533)	25,931
Balance, shares at Jun. 30, 2012		158,295
Balance, value at Dec. 31, 2012	4,185,729	2,151	2,370,677	4,690,378	14,320	(2,914,479)	22,682
Balance, shares at Dec. 31, 2012		158,331
Net income	318,240			301,247			16,993
Other comprehensive loss, net of tax	(27,089)				(27,089)
Dividends declared	(93,294)			(93,294)
Distributions to noncontrolling interests	(13,447)						(13,447)
Issuance of common stock under benefit plans, value	10,183	5	1,256			8,922
Issuance of common stock under benefit plans, shares		664
Stock-based compensation expense	16,515		14,718			1,797
Exercise of stock options, value	63,257		(4,454)			67,704	7
Exercise of stock options, shares		1,306
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(9,883)	(2)	(9,881)
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, shares		(172)
Tax benefits associated with stock-based compensation plans	(390)		(390)
Purchases of treasury stock, value	(511,630)		45,000			(466,630)
Purchases of treasury stock, shares		(8,309)
Other	375						375
Balance, value at Jun. 30, 2013	$ 3,938,566	$ 2,154	$ 2,326,926	$ 4,898,331	$ (12,769)	$ (3,302,686)	$ 26,610
Balance, shares at Jun. 30, 2013		151,820