Taxation - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	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