Condensed Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Cumulative Distributions and Net Loss Attributable to Common Stockholders	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2013	$ 800,559	$ 30	$ 2,646,741	$ (1,847,039)	$ 0	$ 827
Balance (in shares) at Dec. 31, 2013		299,192
Increase (Decrease) in Equity
Net loss	(29,657)			(29,614)		(43)
Unrealized loss on interest rate derivatives	0
Share-based compensation, net (in shares)	72
Share-based compensation, net	212		178			34
Distributions declared	(33)					(33)
Balance at Mar. 31, 2014	771,081	30	2,646,919	(1,876,653)	0	785
Balance (in shares) at Mar. 31, 2014		299,264
Balance at Dec. 31, 2014	783,534	30	2,645,902	(1,862,555)	(788)	945
Balance (in shares) at Dec. 31, 2014		299,264
Increase (Decrease) in Equity
Net loss	(5,902)			(5,892)		(10)
Unrealized loss on interest rate derivatives	(4,556)				(4,548)	(8)
Share-based compensation, net (in shares)	142
Share-based compensation, net	265		220			45
Balance at Mar. 31, 2015	$ 773,341	$ 30	$ 2,646,122	$ (1,868,447)	$ (5,336)	$ 972
Balance (in shares) at Mar. 31, 2015		299,406