Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Gross revenues	$ 81,829	$ 77,371	$ 69,502	$ 62,615	$ 67,599	$ 67,398	$ 63,312	$ 56,458	$ 291,317	$ 254,767	$ 158,064
Net revenue	16,260	32,333	28,857	31,456	42,299	46,033	43,015	28,312	108,906	159,660	73,432
Net income (loss)	(36,460)	(17,173)	(18,708)	(13,141)	(5,144)	3,507	4,748	(5,343)	$ (85,482)	$ (2,231)	$ (18,708)
Net loss attributable to common stockholders	$ (35,857)	$ (16,634)	$ (17,895)	$ (12,573)	$ (4,644)	$ 3,733	$ 4,980	$ (5,343)
Basic (in dollars per share)	$ (0.50)	$ (0.23)	$ (0.25)	$ (0.18)	$ (0.07)	$ 0.05	$ 0.07	$ (0.08)
Diluted (in dollars per share)	$ (0.50)	$ (0.23)	$ (0.25)	$ (0.18)	$ (0.07)	$ 0.05	$ 0.07	$ (0.08)