Condensed Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Preferred Stock [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Parent [Member] Common Stock [Member] USD ($)	Parent [Member] USD ($)	Noncontrolling Interest [Member] USD ($)	Series H Preferred Stock [Member]	Series I Preferred Stock [Member]	Series J Preferred Stock [Member]	Series K Preferred Stock [Member]	Common Stock [Member] USD ($)	Total USD ($)
Balance at Dec. 31, 2012	$ (824,008)	$ (66,182)	$ 102		$ 4,078		$ 5,651,170		$ 4,765,160	$ 167,320						$ 4,932,480
Balance (in Shares) at Dec. 31, 2012			102,000		407,782,000
Contributions from noncontrolling interests										49						49
Comprehensive income:
Net income	67,770								67,770	2,738						70,508
Other comprehensive income, net of tax:
Change in unrealized gain on marketable securities		6,767							6,767							6,767
Change in foreign currency translation adjustment		31,737							31,737	1,273						33,010
Redeemable noncontrolling interests										(1,415)						(1,415)
Dividends ($0.21 per common share; $0.4313 per
Dividends	(100,382)								(100,382)							(100,382)
Distributions to noncontrolling interests										(1,912)						(1,912)
Issuance of stock				5		9,078		9,083							9,083
Issuance of stock (in Shares)				555,000
Surrender of restricted stock					(1)		(1,948)		(1,949)							(1,949)
Surrender of restricted stock (in Shares)					(90,000)
Exercise of common stock options					4		5,768		5,772							5,772
Exercise of common stock options (in Shares)					376,000
Amortization of equity awards							3,777		3,777							3,777
Balance at Mar. 31, 2013	(856,620)	(27,678)	102		4,086		5,667,845		4,787,735	168,053						4,955,788
Balance (in Shares) at Mar. 31, 2013			102,000		408,623,000
Balance at Dec. 31, 2013	(996,058)	(64,982)	102		4,097		5,689,258		4,632,417	137,109						4,769,526
Balance (in Shares) at Dec. 31, 2013			102,000		409,731,000
Comprehensive income:
Net income	87,000								87,000	8,860						95,860
Other comprehensive income, net of tax:
Change in unrealized gain on marketable securities		(3,678)							(3,678)							(3,678)
Change in foreign currency translation adjustment		(8,210)							(8,210)	(178)						(8,388)
Redeemable noncontrolling interests										(1,693)						(1,693)
Dividends ($0.21 per common share; $0.4313 per
Dividends	(106,937)								(106,937)							(106,937)
Distributions to noncontrolling interests										(18,979)						(18,979)
Issuance of stock					7		11,444		11,451							11,451
Issuance of stock (in Shares)					697,000
Surrender of restricted stock					(1)		(2,838)		(2,839)							(2,839)
Surrender of restricted stock (in Shares)					(123,000)
Exercise of common stock options					2		3,301		3,303							3,303
Exercise of common stock options (in Shares)					201,000
Amortization of equity awards							4,704		4,704							4,704
Balance at Mar. 31, 2014	$ (1,015,995)	$ (76,870)	$ 102		$ 4,105		$ 5,705,869		$ 4,617,211	$ 125,119						$ 4,742,330
Balance (in Shares) at Mar. 31, 2014			102,000		410,506,000						70,000	16,000	9,000	7,000