Derivatives - Balance Sheet (Details) $ in Thousands	Jun. 30, 2023 USD ($) agreement	Dec. 31, 2022 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of coinsurance funds withheld reinsurance agreements | agreement	2
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 72,863	$ 23,669
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Asset Derivatives	72,863	23,669
Liability Derivatives	116,576	52,731
Derivatives not designated as hedging instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Asset Derivatives	72,863	23,669
Derivatives not designated as hedging instruments: | Fixed-index products
Derivatives, Fair Value [Line Items]
Liability Derivatives	430,320	387,686
Derivatives not designated as hedging instruments: | Embedded derivative on reinsurance contract
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (313,744)	$ (334,955)