Basis of Presentation - Reconciliation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income (loss) attributable to common stockholders	$ 11,177	$ (23,525)	$ (49,451)	$ (41,951)
Less: allocation to participating securities	(4,310)	0	0	0
Net income (loss) attributable to common stockholders	$ 6,867	$ (23,525)	$ (49,451)	$ (41,951)
Weighted average number of common shares (in shares)	24,924,169	24,599,744	24,811,895	24,598,345
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 0.28	$ (0.96)	$ (1.99)	$ (1.71)
Diluted (in dollars per share)	$ 0.28	$ (0.96)	$ (1.99)	$ (1.71)