Segment Reporting - Reconciliation of Segment Profit to Net Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting [Abstract]
Total profit from all segments	$ 172,330	$ 153,182
General and administrative expenses	(10,335)	(9,832)
Depreciation and amortization	(97,777)	(79,873)
Other income	1,989	2,898
Other expenses	(1,396)	(1,845)
Income from unconsolidated Funds	323	1,551
Interest expense	(35,420)	(33,293)
Net income	29,714	32,788
Less: Net income attributable to noncontrolling interests	(2,791)	(4,087)
Net income attributable to common stockholders	$ 26,923	$ 28,701