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Variable Interest Entities and Noncontrolling Interests - Non-redeemable noncontrolling interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Noncontrolling Interest [Line Items]
Amounts attributable to noncontrolling interests	$ 0	$ 36,697
Other comprehensive (income) loss attributable to noncontrolling interests	0	(4,570)
Non-redeemable noncontrolling interests, end of period	$ 0	876,864
Somers Holdings Ltd
Noncontrolling Interest [Line Items]
Non-redeemable noncontrolling interests, beginning of period		823,007
Additional paid in capital attributable to noncontrolling interests		21,730
Amounts attributable to noncontrolling interests		36,697
Other comprehensive (income) loss attributable to noncontrolling interests		(4,570)
Non-redeemable noncontrolling interests, end of period		$ 876,864

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