Condensed Consolidated Statement of Noncontrolling Interests and Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Series A Preferred Operating Partnership [Member]	Series B Preferred Operating Partnership [Member]	Series C Preferred Operating Partnership [Member]	Series D Preferred Operating Partnership [Member]	Common Operating Partnership [Member]	Other [Member]	Par Value [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Preferred Partner [Member] Series D Preferred Stock [Member] Series D Preferred Operating Partnership [Member]
Balance, beginning of period at Dec. 31, 2016	$ 2,596,166	$ 14,385	$ 41,902	$ 10,730	$ 80,903	$ 203,354	$ 0	$ 1,259	$ 2,566,120	$ 16,770	$ (339,257)
Balance, beginning of period (in shares) at Dec. 31, 2016	125,881,460							125,881,460
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of options	$ 163							$ 0	163
Issuance of common stock upon the exercise of options (in shares)								8,300
Restricted stock grants issued	0							$ 1	(1)
Restricted stock grants issued (in shares)								90,708
Restricted stock grants canceled (in shares)								(2,798)
Compensation expense related to stock-based awards	4,955		0	0	0	0			4,955	0	0
Redemption of Operating Partnership units for cash	(2,510)					(1,238)			(1,272)
Redemption of Operating Partnership units for cash (in shares)								0
Issuance of Preferred D Units in the Operating Partnership in conjunction with acquisitions												$ 6,810
Noncontrolling Interest in consolidated joint venture	1,827						1,827
Net income (loss)	183,832	3,101	1,257	1,352	1,671	7,184	(21)				169,288
Other comprehensive income	233	0				0				233
Distributions to Operating Partnership units held by noncontrolling interests	(16,325)	(3,341)	(1,257)	(1,352)	(1,671)	(8,704)
Dividends paid on common stock at $1.56 per share	(196,468)										(196,468)
Balance, end of period at Jun. 30, 2017	$ 2,578,683	$ 14,145	$ 41,902	$ 10,730	$ 87,713	$ 200,596	$ 1,806	$ 1,260	$ 2,569,965	$ 17,003	$ (366,437)
Balance, end of period (in shares) at Jun. 30, 2017	125,977,670							125,977,670.00