Variable Interest Entities and Noncontrolling Interests - Income or loss attributable to third party investors (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noncontrolling Interest [Abstract]
Amounts attributable to non-redeemable noncontrolling interests	$ (67,768)	$ (136)	$ 578	$ (54,819)
Dividends attributable to redeemable noncontrolling interests	(1,875)	(6,600)	(4,998)	(15,778)
Net (income) loss attributable to noncontrolling interests	$ (69,643)	$ (6,736)	$ (4,420)	$ (70,597)