Earnings Per Share - Summary of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net (loss) income attributable to common stockholders	$ (10,214)	$ (139)	$ 93,174	$ (3,445)
Earnings allocated to unvested participating securities	(13)	(9)	(86)	(28)
Numerator for (loss) income per common share - basic and diluted	$ (10,227)	$ (148)	$ 93,088	$ (3,473)
Denominator:
Denominator for basic (loss) income per common share - weighted average shares	239,445,810	219,394,245	235,151,398	216,317,746
Effect of dilutive employee stock options and restricted share awards			27,000
Denominator for diluted (loss) income per common share - weighted average shares	239,445,810	219,394,245	235,177,683	216,317,746
(Loss) income per common share - basic and diluted	$ (0.04)	$ 0.00	$ 0.40	$ (0.02)