Equity - Schedule of Effects of Changes in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Net income (loss) attributable to common shareholders	$ 14,391	$ (26,975)	$ 53,875	$ 47,781	$ 33,229	$ (7,629)	$ 47,654	$ 31,829	$ 95,624	$ 111,703	$ 93,104
Increase (decrease) in additional paid-in-capital for redemption of noncontrolling OP units									210	165	(858)
Change from net income attributable to shareholders and transfers from noncontrolling interests									$ 95,834	$ 111,868	$ 92,246