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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effects of Reinsurance [Line Items]                      
Annuity product charges                 $ 173,579 $ 136,168 $ 118,990
Change in fair value of derivatives $ 95,391 $ 103,794 $ 39,099 $ (74,065) $ 69,338 $ (351,360) $ (23,024) $ (31,100) 164,219 (336,146) 504,825
Interest sensitive and index product benefits                 725,472 968,053 1,473,700
Change in fair value of embedded derivatives                 543,465 (464,698) 32,321
Other operating costs and expenses                 102,231 96,218 81,584
Coinsurance deposits                 (1,317,555) (80,777) 109,184
Coinsurance Agreements, EquiTrust and Athene [Member]                      
Effects of Reinsurance [Line Items]                      
Annuity product charges                 5,366 5,427 5,956
Change in fair value of derivatives                 18,446 (14,360) 31,076
Coinsurance, revenues included in consolidated statement of operations                 23,812 (8,933) 37,032
Interest sensitive and index product benefits                 93,487 88,923 122,666
Change in fair value of embedded derivatives                 23,848 (22,616) 35,820
Other operating costs and expenses                 24,039 9,922 9,241
Coinsurance, benefits and expenses included in the consolidated statement of operations                 141,374 76,229 167,727
Annuity deposits                 (1,736,054) (471,822) (171,124)
Cash payments to policyholders                 418,499 391,045 280,308
Coinsurance deposits                 $ (1,317,555) $ (80,777) $ 109,184