Condensed Consolidated Statement of Equity (USD $)	Total	Stockholders' Equity, Total [Member]		Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Translation Adjustment [Member]		Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]		Dividends/Distributions in Excess of Earnings [Member]	Noncontrolling Interest [Member]
Balance, value Period Start at Dec. 31, 2013		$ 6,941,175,000		$ 3,341,000	$ 98,000	$ 9,482,769,000	$ 58,261,000		$ (81,873,000)		$ (2,535,879,000)	$ 14,458,000
Preferred Stock, Shares Outstanding Period Start at Dec. 31, 2013					9,775,000
Balance, shares Period Start at Dec. 31, 2013				334,070,016
Stock-based compensation related activity, net of forfeitures, value		11,956,000		0		11,956,000	0		0		0	0
Stock-based compensation related activity, net of forfeitures, shares				14,031
Purchases and retirement of capital stock, value		(21,417,000)		(3,000)		(21,414,000)	0		0		0	0
Purchases and retirement of capital stock, shares				(288,066)
Other comprehensive income (loss)	28,319,000	28,319,000	[1]	0		0	11,489,000	[1]	16,182,000	[1]	0	648,000	[1]
Common stock dividends/distributions		(117,162,000)									(117,162,000)
Preferred stock dividends	(10,997,000)	(10,997,000)									(10,997,000)
Net income (loss)	102,793,000	102,793,000		0		0	0		0		101,497,000	1,296,000
Balance, value Period End at Mar. 31, 2014		6,934,667,000		3,338,000	98,000	9,473,311,000	69,750,000		(65,691,000)		(2,562,541,000)	16,402,000
Preferred Stock, Shares Outstanding Period End at Mar. 31, 2014					9,775,000
Balance, shares Period End at Mar. 31, 2014				333,795,981
Balance, value Period Start at Dec. 31, 2014	6,737,228,000	6,737,228,000		3,339,000	98,000	9,512,396,000	34,545,000		(18,725,000)		(2,815,428,000)	21,003,000
Preferred Stock, Shares Outstanding Period Start at Dec. 31, 2014	9,775,000				9,775,000
Balance, shares Period Start at Dec. 31, 2014	333,856,632			333,856,632
Stock-based compensation related activity, net of forfeitures, value		20,311,000		2,000		20,309,000			0		0	0
Stock-based compensation related activity, net of forfeitures, shares				238,416
Purchases and retirement of capital stock, value		(29,372,000)		(2,000)		(29,370,000)			0		0	0
Purchases and retirement of capital stock, shares				(333,089)
Other comprehensive income (loss)	(8,771,000)	(8,771,000)	[1]	0		0	(15,007,000)	[1]	7,491,000	[1]	0	(1,255,000)	[1]
Common stock dividends/distributions		(274,718,000)									(274,718,000)
Preferred stock dividends	(10,997,000)	(10,997,000)									(10,997,000)
Net income (loss)	125,112,000	125,112,000		0		0			0		122,787,000	2,325,000
Balance, value Period End at Mar. 31, 2015	$ 6,558,793,000	$ 6,558,793,000		$ 3,339,000	$ 98,000	$ 9,503,335,000	$ 19,538,000		$ (11,234,000)		$ (2,978,356,000)	$ 22,073,000
Preferred Stock, Shares Outstanding Period End at Mar. 31, 2015	9,775,000				9,775,000
Balance, shares Period End at Mar. 31, 2015	333,761,959			333,761,959

[1] See the condensed statement of operations and other comprehensive income (loss) for the components of "other comprehensive income (loss)" and note 3 with respect to the reclassification adjustment.