CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	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)			2,515,406
OP units converted to common stock	0	23,239	$ 25	23,214			(23,239)
Equity-based compensation and retirement of vested shares (in shares)			(16,928)
Equity-based compensation and retirement of vested shares	(6,605)	(72)		(72)			(6,533)
Dividends declared on common stock and distributions to non-controlling interest holders	(19,312)	(18,884)				(18,884)	(428)
Net income (loss)	419	487				487	(68)
Unrealized loss on derivatives	(879)	(879)			(879)
Ending Balance (in shares) at Mar. 31, 2016			165,028,289
Ending Balance at Mar. 31, 2016	$ 1,065,892	$ 1,038,631	$ 1,651	$ 1,426,766	$ (2,116)	$ (387,670)	$ 27,261