Investment Information - Other investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	$ 1,644,197	$ 1,973,550
Fixed maturities
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	554,120	416,698
Other investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	1,043,184	1,432,553
Short-term investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	33,101	97,806
Equity securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	$ 13,792	$ 26,493