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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effects of Reinsurance [Line Items]                      
Annuity product charges                 $ 136,168 $ 118,990 $ 103,591
Change in fair value of derivatives $ 69,338 $ (351,360) $ (23,024) $ (31,100) $ 146,231 $ 39,218 $ 270,883 $ 48,493 (336,146) 504,825 1,076,015
Interest sensitive and index product benefits                 968,053 1,473,700 1,272,867
Change in fair value of embedded derivatives                 (464,698) 32,321 133,968
Other operating costs and expenses                 96,218 81,584 91,915
Coinsurance deposits                 (80,777) 109,184 25,729
Coinsurance Agreements, EquiTrust and Athene [Member]                      
Effects of Reinsurance [Line Items]                      
Annuity product charges                 5,427 5,956 6,551
Change in fair value of derivatives                 (14,360) 31,076 60,876
Coinsurance, revenues included in consolidated statement of operations                 (8,933) 37,032 67,427
Interest sensitive and index product benefits                 88,923 122,666 117,934
Change in fair value of embedded derivatives                 (22,616) 35,820 2,898
Other operating costs and expenses                 9,922 9,241 9,926
Coinsurance, benefits and expenses included in the consolidated statement of operations                 76,229 167,727 130,758
Annuity deposits                 (471,822) (171,124) (182,616)
Cash payments to policyholders                 391,045 280,308 208,345
Coinsurance deposits                 $ (80,777) $ 109,184 $ 25,729