Variable Interest Entities and Noncontrolling Interests - Income or loss attributable to third party investors (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Noncontrolling Interest [Abstract]
Amounts attributable to non-redeemable noncontrolling interests	$ (165,598)	$ (12,301)	$ 68,346	$ (54,683)
Dividends attributable to redeemable noncontrolling interests	(1,970)	(4,590)	(3,123)	(9,178)
Net (income) loss attributable to noncontrolling interests	$ (167,568)	$ (16,891)	$ 65,223	$ (63,861)