Reinsurance - Reinsurance Recoverables and Financial Strength Ratings by Reinsurer (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ 4,015,909	$ 4,268,419
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]	2,440,274
Pecan Re Inc [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[1],[2]		2,567,602
SCOR Global Life Reinsurance Companies [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[3]	394,171	426,634
Munich Re of Malta [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[2],[4]	251,078	278,591
Swiss Re Life & Health America Inc. [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[5]	244,056	259,239
American Health and Life Insurance Company [Member] | AM Best, B++ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[2]	146,779	157,837
Munich American Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		134,570	142,705
Korean Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		123,026	134,048
RGA Reinsurance [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		128,443	140,953
Hannover Life Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		47,870	49,749
TOA Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		35,762	38,909
All Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		72,816	75,094
Allowance for Credit Losses [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ (2,936)	$ (2,942)

[1] Effective April 1, 2022, the coinsurance agreement with Pecan Re Inc. was novated and replaced by an agreement with Swiss Re Life and Health America, Inc.

[2] 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 receivable from other reinsurers. Arrangements with these reinsurers include collateral trust agreements held in support of reinsurance recoverables.

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

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

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