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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effects of Reinsurance [Line Items]                      
Annuity product charges                 $ 224,488 $ 200,494 $ 173,579
Change in fair value of derivatives $ (1,054,281) $ 595,311 $ 132,205 $ (451,083) $ 661,993 $ 362,525 $ 266,820 $ 386,533 (777,848) 1,677,871 164,219
Interest sensitive and index product benefits                 1,610,835 2,023,668 725,472
Change in fair value of embedded derivatives                 (1,389,491) 919,735 543,465
Other operating costs and expenses                 129,301 111,691 102,231
Coinsurance deposits                 (23,838) (6,597) (1,317,555)
Coinsurance Agreements, EquiTrust and Athene                      
Effects of Reinsurance [Line Items]                      
Annuity product charges                 7,074 6,458 5,366
Change in fair value of derivatives                 (41,487) 94,382 18,446
Coinsurance, revenues included in consolidated statement of operations                 (34,413) 100,840 23,812
Interest sensitive and index product benefits                 165,485 177,332 93,487
Change in fair value of embedded derivatives                 (92,649) 35,561 23,848
Other operating costs and expenses                 20,415 19,877 24,039
Coinsurance, benefits and expenses included in the consolidated statement of operations                 93,251 232,770 141,374
Annuity deposits                 (413,222) (387,280) (1,736,054)
Cash payments to policyholders                 389,384 380,683 418,499
Coinsurance deposits                 $ (23,838) $ (6,597) $ (1,317,555)