Reinsurance - Reinsurance Recoverables Estimated by Reinsurer and Financial Strength Ratings of Reinsurer (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ 2,833,055	$ 3,015,777
Swiss Re Life & Health America Inc. (Novated from Pecan Re, Inc.) [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[1]	2,131,772	2,271,223
Munich Re of Malta [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[1],[2]	222,398	243,890
American Health and Life Insurance Company [Member] | AM Best, B++ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[1]	131,775	141,771
SCOR Global Life Reinsurance Companies [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[3]	157,512	160,381
Swiss Re Life & Health America Inc. [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[4]	45,609	43,873
RGA Reinsurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		42,332	43,188
Korean Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		42,152	41,373
Munich American Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		40,819	50,273
All Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		19,808	20,925
Allowance for Credit Losses [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ (1,122)	$ (1,120)

[1] Reinsurance recoverables include balances ceded under coinsurance transactions of term life insurance policies that were in-force as of December 31, 2009. Amounts shown are net of their share of the reinsurance recoverable from other reinsurers. Arrangements with these reinsurers include collateral trust agreements held in support of reinsurance recoverables.

[2] Entity is rated AA- by S&P.

[3] Includes amounts ceded to Transamerica Reinsurance Companies and fully retroceded to SCOR Global Life Reinsurance Companies.

[4] Includes amounts ceded to Lincoln National Life Insurance and fully retroceded to Swiss Re Life & Health America Inc.