CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, at Cost	Non-controlling Interests
Balance, value at Dec. 31, 2010	$ 4,054,125	$ 2,142	$ 2,311,421	$ 3,867,420	$ 10,626	$ (2,158,129)	$ 20,645
Balance, shares at Dec. 31, 2010		170,717
Net income	124,865			109,282			15,583
Other comprehensive income (loss), net of tax	23,417				23,417
Dividends declared	(31,665)			(31,665)
Distributions to noncontrolling interests	(16,850)						(16,850)
Issuance of common stock under benefit plans, value	10,051	7	1,274			8,770
Issuance of common stock under benefit plans, shares		972
Stock-based compensation expense	35,192		33,418			1,774
Exercise of stock options, value	97,216		(16,220)			113,436
Exercise of stock options, shares		2,240
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(19,286)	(3)	(19,283)
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, shares		(339)
Tax benefits associated with stock-based compensation plans	6,464		6,464
Purchases of treasury stock, value	(835,001)					(835,001)
Purchases of treasury stock, shares		(15,378)
Other	2,068						2,068
Balance, value at Jun. 30, 2011	3,450,596	2,146	2,317,074	3,945,037	34,043	(2,869,150)	21,446
Balance, shares at Jun. 30, 2011		158,212
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 income (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		(1,729)
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