Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income (loss) attributable to common shareholders	$ (180,997)	$ (138,446)	$ (138,652)	$ 33,810	$ 11,404	$ 21,752	$ 52,234	$ (2,504)	$ (424,285)	$ 82,886	$ (4,073)
Less: dividends paid on unvested share-based compensation									(8)	(294)	(332)
Net income (loss) available to common shareholders									$ (424,293)	$ 82,592	$ (4,405)
Denominator:
Weighted-average number of common shares — basic (in shares)									130,610,015	130,471,670	74,286,307
Effect of dilutive share-based compensation (in shares)									0	246,636	0
Weighted-average number of common shares — diluted (in shares)									130,610,015	130,718,306	74,286,307
Net income (loss) per share available to common shareholders — basic (in usd per share)	$ (1.39)	$ (1.06)	$ (1.06)	$ 0.26	$ 0.08	$ 0.17	$ 0.40	$ (0.02)	$ (3.25)	$ 0.63	$ (0.06)
Net income (loss) per share available to common shareholders — diluted (in usd per share)	$ (1.39)	$ (1.06)	$ (1.06)	$ 0.26	$ 0.08	$ 0.17	$ 0.40	$ (0.02)	$ (3.25)	$ 0.63	$ (0.06)