Equity - Net Income Attributable To Common Stockholders And Transfers (To) From Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Net income attributable to common stockholders	$ 19,049	$ 15,366
Exchange of OP Units with noncontrolling interests	4,523	5,847
Net transfers from noncontrolling interests	4,523	5,847
Change from net income attributable to common stockholders and transfers from noncontrolling interests	$ 23,572	$ 21,213