Reinsurance - Reinsurance Recoverables and Financial Strength Ratings by Reinsurer (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ 4,217,129	$ 4,169,823
Pecan Re Inc [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[1],[2]	2,690,787	2,696,924
SCOR Global Life Reinsurance Companies [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[3]	370,047	352,049
Munich Re of Malta [Member] | External credit rating, not rated [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[2]	268,527	286,433
Swiss Re Life & Health America Inc. [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[4]	233,397	233,572
American Health and Life Insurance Company [Member] | AM Best, B++ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	[2]	164,853	167,471
Munich American Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		128,362	118,372
Korean Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		117,399	108,410
RGA Reinsurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		115,602	100,328
Hannover Life Reassurance Company [Member] | AM Best, A+ Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		37,822	33,772
TOA Reinsurance Company [Member] | AM Best, A Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		33,839	26,160
All Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		62,096	48,679
Allowance for Credit Losses [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables		$ (5,602)	$ (2,347)

[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.

[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.