Equity - Schedule of Effects of Changes in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Net income (loss) attributable to common shareholders	$ 33,229	$ (7,629)	$ 47,654	$ 31,829	$ 35,700	$ 38,720	$ 12,743	$ (839)	$ 111,703	$ 93,104	$ 1,630
Increase (decrease) in additional paid-in-capital for redemption of noncontrolling OP units									165	(858)	1,053
Change from net income attributable to shareholders and transfers from noncontrolling interests									$ 111,868	$ 92,246	$ 2,683