Earnings Per Share - Summary of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income (loss) attributable to common stockholders	$ 103,016	$ 3,188	$ 103,388	$ (3,306)
Earnings allocated to unvested participating securities	(59)	(10)	(73)	(19)
Numerator for income (loss) per common share - basic and diluted	$ 102,957	$ 3,178	$ 103,315	$ (3,325)
Denominator:
Denominator for basic income (loss) per common share - weighted average shares	234,990,468	217,121,592	232,968,602	214,762,593
Effect of dilutive employee stock options and restricted share awards	20,000	16,000	27,000
Denominator for diluted income (loss) per common share - weighted average shares	235,010,830	217,137,557	232,995,822	214,762,593
Income (loss) per common share - basic and diluted	$ 0.44	$ 0.01	$ 0.44	$ (0.02)