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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Noncontrolling Interest [Abstract]
Amounts attributable to non-redeemable noncontrolling interests	$ 0	$ (67,768)	$ (78,314)	$ 578
Amounts attributable to redeemable noncontrolling interests	(1,473)	(1,875)	(3,889)	(4,998)
Net (income) loss attributable to noncontrolling interests	$ (1,473)	$ (69,643)	$ (82,203)	$ (4,420)