Equity - Schedule of Effects of Changes in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Net income (loss) attributable to common shareholders	$ 23,796	$ 216,190	$ (3,327)	$ (15,957)	$ 29,235	$ 3,916	$ 5,519	$ 40,397	$ 227,415	$ 85,583	$ 95,624
Increase in additional paid-in-capital for redemption of noncontrolling OP units									189	584	210
Change from net income attributable to shareholders and transfers from noncontrolling interests									$ 227,604	$ 86,167	$ 95,834