Condensed Consolidated Statement of Equity - USD ($)	Total	At the Market Program [Member]	Stockholders' Equity, Total [Member]		Stockholders' Equity, Total [Member] At the Market Program [Member]	Common Stock [Member]	Common Stock [Member] At the Market Program [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] At the Market Program [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]		Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]		Dividends/Distributions in Excess of Earnings [Member]	Noncontrolling Interest [Member]
Balance, shares Period Start at Dec. 31, 2015						333,771,660
Balance, value Period Start at Dec. 31, 2015			$ 7,089,221,000			$ 3,338,000		$ 98,000	$ 9,548,580,000		$ (4,398,000)		$ 0		$ (2,458,397,000)	$ 0
Preferred Stock, Shares Outstanding Period Start at Dec. 31, 2015								9,775,000
Stock-based compensation related activity, net of forfeitures, value			26,875,000			$ 2,000			26,873,000		0		0		0	0
Stock-based compensation related activity, net of forfeitures, shares						243,110
Purchases and retirement of capital stock, value			(24,354,000)			$ (3,000)			(24,351,000)		0		0		0	0
Stock Issued During Period, Shares, New Issues						3,828,064
Stock Issued During Period, Value, New Issues						$ 38,000			323,760,000
Proceeds from Issuance of Common Stock	$ 323,798,000
Purchases and retirement of capital stock, shares						(283,116)
Other comprehensive income (loss)	(579,000)		(579,000)	[1]		$ 0			0		(579,000)	[1]	0	[1]	0	0	[1]
Common stock dividends/distributions			(298,810,000)												(298,810,000)
Preferred stock dividends	(10,997,000)		(10,997,000)												(10,997,000)
Net income (loss)	$ 47,840,000		47,840,000			$ 0			0		0		0		47,840,000	0
Balance, shares Period End at Mar. 31, 2016						337,559,718
Balance, value Period End at Mar. 31, 2016			7,152,994,000			$ 3,375,000		$ 98,000	9,874,862,000		(4,977,000)		0		(2,720,364,000)	0
Preferred Stock, Shares Outstanding Period End at Mar. 31, 2016								9,775,000
Balance, shares Period Start at Dec. 31, 2016	360,536,659					360,536,659
Balance, value Period Start at Dec. 31, 2016	$ 7,557,115,000		7,557,115,000			$ 3,605,000		$ 0	10,938,236,000		(5,888,000)		0		(3,378,838,000)	0
Preferred Stock, Shares Outstanding Period Start at Dec. 31, 2016	0							0
Stock-based compensation related activity, net of forfeitures, value			30,405,000			$ 9,000			30,396,000		0		0		0	0
Stock-based compensation related activity, net of forfeitures, shares						822,692
Purchases and retirement of capital stock, value			(22,005,000)			$ (2,000)			(22,003,000)		0		0		0	0
Stock Issued During Period, Shares, New Issues							242,300
Proceeds from Issuance of Common Stock	$ 21,937,000	$ 22,009,000			$ (21,937,000)		$ (2,000)			$ (21,935,000)
Purchases and retirement of capital stock, shares						(246,608)
Other comprehensive income (loss)	175,000		175,000	[2]		$ 0			0		175,000	[2]	0	[2]	0	0	[2]
Common stock dividends/distributions			(343,285,000)												(343,285,000)
Preferred stock dividends	0
Net income (loss)	$ 119,138,000		119,138,000			$ 0			0		0		0		119,138,000	0
Balance, shares Period End at Mar. 31, 2017	361,355,043					361,355,043
Balance, value Period End at Mar. 31, 2017	$ 7,363,480,000		$ 7,363,480,000			$ 3,614,000		$ 0	$ 10,968,564,000		$ (5,713,000)		$ 0		$ (3,602,985,000)	$ 0
Preferred Stock, Shares Outstanding Period End at Mar. 31, 2017	0							0

[1] See the condensed statement of operations and other comprehensive income (loss) for the components of "other comprehensive income (loss)."

[2] See the condensed statement of operations and other comprehensive income (loss) for the components of "other comprehensive income (loss)."