Condensed Consolidated Statement of Noncontrolling Interests and Equity - 3 months ended Mar. 31, 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]	Par Value [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Balance, beginning of period at Dec. 31, 2016	$ 2,596,166	$ 14,385	$ 41,902	$ 10,730	$ 80,903	$ 203,354	$ 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]
Restricted stock grants issued	$ 0						$ 0
Restricted stock grants issued (in shares)							31,179
Restricted stock grants canceled (in shares)							(475)
Compensation expense related to stock-based awards	1,990		0	0	0	0		1,990	0	0
Redemption of Operating Partnership units for cash	(1,754)					(872)		(882)
Redemption of Operating Partnership units for cash (in shares)							0
Net income	89,734	1,818	629	676	828	3,501				82,282
Other comprehensive income	6,334	39				249			6,046
Distributions to Operating Partnership units held by noncontrolling interests	(8,443)	(1,954)	(629)	(676)	(828)	(4,356)
Dividends paid on common stock at $0.78 per share	(98,212)									(98,212)
Balance, end of period at Mar. 31, 2017	$ 2,585,815	$ 14,288	$ 41,902	$ 10,730	$ 80,903	$ 201,876	$ 1,259	$ 2,567,228	$ 22,816	$ (355,187)
Balance, end of period (in shares) at Mar. 31, 2017	125,912,164						125,912,164