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Reinsurance and Policy Provisions (Amounts Ceded to EquiTrust and Athene, Impact on Consolidated Statements of Operations and Consolidated Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effects of Reinsurance [Line Items]                      
Annuity product charges                 $ 251,227 $ 240,035 $ 224,488
Change in fair value of derivatives $ 443,867 $ 205,011 $ 327,662 $ (941,874) $ 466,434 $ (20,042) $ 76,045 $ 384,469 34,666 906,906 (777,848)
Interest sensitive and index product benefits                 1,543,270 1,287,576 1,610,835
Change in fair value of embedded derivatives                 (1,286,787) 1,454,042 (1,389,491)
Other operating costs and expenses                 183,636 154,153 129,301
Coinsurance deposits                 430,644 91,238 (23,838)
Coinsurance deposits, allowance for credit losses $ 1,888       $ 0       1,888 0  
Coinsurance Agreements, EquiTrust and Athene                      
Effects of Reinsurance [Line Items]                      
Annuity product charges                 7,021 7,792 7,074
Change in fair value of derivatives                 43,080 97,195 (41,487)
Coinsurance, revenues included in consolidated statement of operations                 50,101 104,987 (34,413)
Interest sensitive and index product benefits                 152,485 132,127 165,485
Change in fair value of embedded derivatives                 4,352 109,002 (92,649)
Other operating costs and expenses                 17,663 18,778 20,415
Coinsurance, benefits and expenses included in the consolidated statement of operations                 174,500 259,907 93,251
Annuity deposits                 (35,667) (290,040) (413,222)
Cash payments to policyholders                 466,311 381,276 389,384
Coinsurance deposits                 $ 430,644 $ 91,236 $ (23,838)