Equity - Net Income Attributable to Common Stockholders and Transfers (to) from Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Net income attributable to common stockholders	$ 31,684	$ 20,244	$ 59,890	$ 39,293
Transfers from noncontrolling interests:
Exchange of OP Units with noncontrolling interests			5,481	8,856
Repurchase of OP Units from noncontrolling interests			(59)	0
Net transfers from noncontrolling interests			5,422	8,856
Change from net income attributable to common stockholders and transfers from noncontrolling interests			$ 65,312	$ 48,149