Quarterly Operating Results (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 74,209	$ 76,980	$ 22,592	$ 269,107	$ 379,409	$ 423,552	$ 442,083	$ 367,169	$ 442,888	$ 1,612,213	$ 828,678
Net income (loss)	(173,187)	(130,560)	(130,914)	42,068	19,572	29,980	60,518	5,655	(392,593)	115,725	13,385
Net income (loss) attributable to the Company	(172,858)	(130,307)	(130,513)	41,949	19,543	29,891	60,373	5,635	(391,729)	115,442	13,393
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)
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)