Investments - Schedule of Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Gross investment income	$ 581,549	$ 340,229	$ 372,593
Investment expenses	(21,617)	(20,750)	(18,555)
Net investment income	559,932	319,479	354,038
Fixed maturity investments
Net Investment Income [Line Items]
Gross investment income	382,165	234,911	278,215
Short term investments
Net Investment Income [Line Items]
Gross investment income	41,042	2,333	20,799
Equity investments
Net Investment Income [Line Items]
Gross investment income	20,864	9,017	6,404
Catastrophe bonds
Net Investment Income [Line Items]
Gross investment income	94,784	64,860	54,784
Other
Net Investment Income [Line Items]
Gross investment income	37,497	28,811	9,417
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income	$ 5,197	$ 297	$ 2,974