CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Non-controlling Interests
Beginning Balance (in shares) at Dec. 31, 2015			162,529,811
Beginning Balance at Dec. 31, 2015	$ 1,092,269	$ 1,034,740	$ 1,626	$ 1,403,624	$ (1,237)	$ (369,273)	$ 57,529
Increase (Decrease) in Stockholders' Equity [Roll Forward]
OP units converted to common stock (in shares)			2,610,065
OP units converted to common stock		24,001	$ 26	23,975
OP units converted to common stock, non-controlling interests							(24,001)
Equity-based compensation and redemption of vested shares (in shares)			(11,823)
Equity-based compensation and redemption of vested shares	(8,533)	109		109			(8,642)
Dividends declared on common stock and distributions to non-controlling interest holders	(39,346)	(37,871)				(37,871)	(1,475)
Net loss	(11,388)	(11,053)				(11,053)	(335)
Unrealized loss on derivatives	(978)	(978)			(978)
Ending Balance (in shares) at Jun. 30, 2016			165,128,053
Ending Balance at Jun. 30, 2016	$ 1,032,024	$ 1,008,948	$ 1,652	$ 1,427,708	$ (2,215)	$ (418,197)	$ 23,076