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Variable Interest Entities and Noncontrolling Interests - Non-redeemable noncontrolling interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Noncontrolling Interest [Line Items] |  |  |  |  |
Non-redeemable noncontrolling interests, beginning of period |  |  |  | $ 823,007 |
Amounts attributable to noncontrolling interests |  | $ 0 | $ 67,768 | 78,314 | $ (578)
Other comprehensive (income) loss attributable to noncontrolling interests |  | (9,423) | 10,820 | (13,983) | (2,127)
Non-redeemable noncontrolling interests, end of period |  | 0 | 757,920 | 0 | 757,920
Watford Holdings Ltd |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Non-redeemable noncontrolling interests, beginning of period |  | 918,874 | 679,089 | 823,007 | 762,777
Impact of deconsolidation of Watford |  | (918,874) | 0 | (918,874) |
Additional paid in capital attributable to noncontrolling interests |  | 0 | 243 | 22,113 | 715
Repurchases attributable to non-redeemable noncontrolling interests | [1] |  |  | 0 | (2,867)
Amounts attributable to noncontrolling interests |  | 0 | 67,768 | 78,314 | (578)
Other comprehensive (income) loss attributable to noncontrolling interests |  | 0 | 10,820 | (4,560) | (2,127)
Non-redeemable noncontrolling interests, end of period |  | $ 0 | $ 757,920 | $ 0 | $ 757,920
[1] | During 2020, Watford’s board of directors authorized the investment in Watford’s common shares through a share repurchase program.

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