Earnings Per Share - Summary of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net (loss) income attributable to common stockholders	$ (50,145)	$ 7,082	$ 2,455	$ 3,709	$ 5,318	$ 37,531	$ (34,816)	$ 1,114	$ (36,899)	$ 9,147	$ 86,381
Earnings allocated to unvested participating securities									(71)	(79)	(98)
Numerator for (loss) income per common share - basic and diluted									$ (36,970)	$ 9,068	$ 86,283
Denominator:
Weighted average shares outstanding									231,538,065	239,526,694	236,372,801
Effect of dilutive employee stock options and restricted share awards										29,000	29,000
Denominator for diluted (loss) income per common share - weighted average shares									231,538,065	239,555,636	236,401,548
(Loss) income per common share - basic and diluted									$ (0.16)	$ 0.04	$ 0.37