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Taxation - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Expected income tax benefit (expense) | $ (103,963) | $ 114,721 | $ 53,093
Nondeductible expenses | (535) | (508) | (334)
Reinsurance adjustment | 4,746 | (1,265) | (4,604)
Effect of change in tax rate | (729) | 7,461 | 14,904
Transfer pricing | 0 | 0 | 224
GAAP to statutory accounting difference | (1,781) | (6,019) | 0
U.S. base erosion and anti-abuse tax | 0 | 0 | (1,725)
Withholding tax | (1,078) | (2,154) | (1,013)
Recognition of Bermuda net deferred tax asset | 593,765 | 0 | 0
Change in valuation allowance | 45,192 | (62,133) | (42,819)
Foreign branch adjustments | (25,908) | 11,656 | (5,491)
Other | 358 | (2,740) | (1,567)
Income tax benefit (expense) | $ 510,067 | $ 59,019 | $ 10,668

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