Equity - Change in Net Income Attributable to Common Shareholders (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Net income attributable to common stockholders	$ 15,882	$ 16,342	$ 32,646	$ 42,761
Increase in additional paid-in capital for the conversion of OP Units into common stock	0	0	0	0
Change from net income attributable to common stockholders and transfers from non-controlling interests	28,790	22,107	54,419	74,366
Additional Paid-In Capital
Class of Stock [Line Items]
Increase in additional paid-in capital for the conversion of OP Units into common stock	$ 12,908	$ 5,765	$ 21,773	$ 31,605