Variable Interest Entities and Noncontrolling Interests - Non-redeemable noncontrolling interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Noncontrolling Interest [Line Items]
Amounts attributable to noncontrolling interests	$ 0	$ 41,617	$ 0	$ 78,314
Other comprehensive (income) loss attributable to noncontrolling interests	0	10	0	(4,560)
Non-redeemable noncontrolling interests, end of period	$ 0	918,874	$ 0	918,874
Somers Holdings Ltd
Noncontrolling Interest [Line Items]
Non-redeemable noncontrolling interests, beginning of period		876,864		823,007
Additional paid in capital attributable to noncontrolling interests		383		22,113
Amounts attributable to noncontrolling interests		41,617		78,314
Other comprehensive (income) loss attributable to noncontrolling interests		10		(4,560)
Non-redeemable noncontrolling interests, end of period		$ 918,874		$ 918,874