Reinsurance - Reinsurance Recoverables and Financial Strength Ratings by Reinsurer (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ 4,345,483	$ 4,273,904
Pecan Re Inc [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[1],[2]	2,687,103	2,654,698
SCOR Global Life Reinsurance Companies [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[3]	407,516	395,804
Munich Re of Malta [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[2],[4]	290,049	285,350
Swiss Re Life & Health America Inc. [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[5]	247,324	251,409
American Health and Life Insurance Company [Member] | AM Best, B++ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[2]	163,221	163,082
Munich American Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		140,007	137,312
Korean Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		130,516	125,492
RGA Reinsurance [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		131,639	123,568
Hannover Life Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		46,565	41,201
TOA Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		39,625	34,212
All Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		69,281	68,920
Allowance for Credit Losses [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ (7,363)	$ (7,144)

[1] Pecan Re Inc. is a wholly owned subsidiary of Swiss Re Life & Health America Inc.

[2] Reinsurance recoverables includes 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 recoverables 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.