Condensed Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Series H Preferred Stock [Member]	Series I Preferred Stock [Member]	Series J Preferred Stock [Member]	Series K Preferred Stock [Member]	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Preferred Stock [Member] USD ($)	Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Parent [Member] USD ($)	Noncontrolling Interest [Member] USD ($)	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											937	937
Comprehensive income:
Net income					174,672					174,672	6,296	180,968
Other comprehensive income, net of tax:
Change in unrealized gain on marketable securities						23,888				23,888		23,888
Change in foreign currency translation adjustment						(1,834)				(1,834)	(365)	(2,199)
Redeemable noncontrolling interests											(5,140)	(5,140)
Dividends					(301,569)					(301,569)		(301,569)
Distributions to noncontrolling interests											(6,387)	(6,387)
Issuance of stock								5	9,208	9,213		9,213
Issuance of stock (in Shares)								560,000
Surrender of restricted stock								(2)	(3,849)	(3,851)		(3,851)
Surrender of restricted stock (in Shares)								(245,000)
Exercise of common stock options								16	29,028	29,044		29,044
Exercise of common stock options (in Shares)								1,559,000
Acquisition of noncontrolling interests									(5,992)	(5,992)	(20,096)	(26,088)
Amortization of equity awards									8,856	8,856		8,856
Balance at Sep. 30, 2013					(950,905)	(44,128)	102	4,097	5,688,421	4,697,587	142,565	4,840,152
Balance (in Shares) at Sep. 30, 2013							102,000	409,656,000
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
Contributions from noncontrolling interests											3,098	3,098
Comprehensive income:
Net income					371,220					371,220	13,899	385,119
Other comprehensive income, net of tax:
Change in unrealized gain on marketable securities						13,980				13,980		13,980
Change in foreign currency translation adjustment						(17,618)				(17,618)	(189)	(17,807)
Redeemable noncontrolling interests											(4,779)	(4,779)
Dividends					(321,111)					(321,111)		(321,111)
Distributions to noncontrolling interests											(25,150)	(25,150)
Issuance of stock								8	13,827	13,835		13,835
Issuance of stock (in Shares)								805,000
Surrender of restricted stock								(2)	(3,979)	(3,981)		(3,981)
Surrender of restricted stock (in Shares)								(187,000)
Exercise of common stock options								10	16,077	16,087		16,087
Exercise of common stock options (in Shares)								989,000
Acquisition of noncontrolling interests									(53)	(53)	(766)	(819)
Amortization of equity awards									7,699	7,699		7,699
Balance at Sep. 30, 2014					$ (945,949)	$ (68,620)	$ 102	$ 4,113	$ 5,722,829	$ 4,712,475	$ 123,222	$ 4,835,697
Balance (in Shares) at Sep. 30, 2014	70,000	16,000	9,000	7,000			102,000	411,338,000