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Investments - Schedule of Analysis of Investment Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Investment income, gross									$ 1,074,157	$ 1,009,582	$ 973,601
Less investment expense									(17,273)	(17,782)	(16,911)
Net investment income	$ 271,609	$ 266,926	$ 261,244	$ 257,105	$ 255,483	$ 246,711	$ 244,712	$ 244,894	1,056,884	991,800	956,690
Fixed maturities available for sale
Net Investment Income [Line Items]
Investment income, gross									944,628	910,284	892,421
Policy loans
Net Investment Income [Line Items]
Investment income, gross									49,011	46,586	45,318
Mortgage loans
Net Investment Income [Line Items]
Investment income, gross									19,541	9,719	8,831
Other long-term investments
Net Investment Income [Line Items]
Investment income, gross									54,655	40,837	27,007
Short-term investments
Net Investment Income [Line Items]
Investment income, gross									6,322	2,156	24
Fair value option
Net Investment Income [Line Items]
Net investment income									$ 52,300	$ 40,300	$ 26,700