Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 10,446	$ (47,948)	$ (33,092)
Unrealized gain (loss) on interest rate cap agreement:
Unrealized loss on interest rate cap agreement arising during the period	0	(14)	(229)
Reclassification adjustment for amortization of interest expense included in net income (loss)	130	141	0
Unrealized gain on investment in equity securities	67	0	0
Other comprehensive income (loss)	197	127	(229)
Comprehensive income (loss)	10,643	(47,821)	(33,321)
Comprehensive income attributable to noncontrolling interests	3,714	14,345	14,979
Dividends on preferred shares	40,237	22,276	18,928
Comprehensive loss attributable to common shareholders	$ (33,308)	$ (84,442)	$ (67,228)