Quarterly Operating Results (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 379,409	$ 423,552	$ 442,083	$ 367,169	$ 235,642	$ 205,480	$ 206,501	$ 181,055	$ 1,612,213	$ 828,678	$ 769,317
Net income (loss)	19,572	29,980	60,518	5,655	(99,343)	29,917	58,295	24,516	115,725	13,385	100,262
Net income (loss) attributable to the Company	19,543	29,891	60,373	5,635	(98,911)	29,792	58,103	24,409	115,442	13,393	99,888
Net income (loss) attributable to common shareholders	$ 11,404	$ 21,752	$ 52,234	$ (2,504)	$ (104,307)	$ 25,769	$ 54,079	$ 20,386	$ 82,886	$ (4,073)	$ 83,794
Net income (loss) per share available to common shareholders, basic (in usd per share)	$ 0.08	$ 0.17	$ 0.40	$ (0.02)	$ (1.16)	$ 0.37	$ 0.78	$ 0.29	$ 0.63	$ (0.06)	$ 1.20
Net income (loss) per share available to common shareholders, diluted (in usd per share)	$ 0.08	$ 0.17	$ 0.40	$ (0.02)	$ (1.16)	$ 0.37	$ 0.78	$ 0.29	$ 0.63	$ (0.06)	$ 1.19