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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Intangible assets, accumulated amortization	$ 256	$ 1,511
Indebtedness, unamortized discount and deferred financing costs	$ 5,500	$ 6,198
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	88,920,879	84,708,551
Common stock, shares outstanding	88,920,879	84,708,551
Unvested restricted common share awards	313,254	295,847

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