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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

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