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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, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Coinsurance [Line Items]      
Annuity product charges $ 103,591 $ 89,006 $ 76,189
Change in fair value of derivatives 1,076,015 221,138 (114,728)
Interest sensitive and index product benefits 1,272,867 808,479 775,097
Change in fair value of embedded derivatives 133,968 286,899 (105,194)
Other operating costs and expenses 91,915 95,495 67,559
Cash payments to policyholders 1,763,913 1,575,340 1,494,554
Coinsurance deposits (25,729) (4,885) 122,415
Coinsurance Agreements, EquiTrust and Athene [Member]
      
Coinsurance [Line Items]      
Annuity product charges 6,551 6,796 8,149
Change in fair value of derivatives 60,876 17,106 (2,771)
Coinsurance, revenues included in consolidated statement of operations 67,427 23,902 5,378
Interest sensitive and index product benefits 117,934 94,113 99,724
Change in fair value of embedded derivatives 2,898 9,373 (12,428)
Other operating costs and expenses 9,926 9,333 8,970
Coinsurance, benefits and expenses included in the consolidated statement of operations 130,758 112,819 96,266
Annuity deposits (182,616) (203,552) (326,531)
Cash payments to policyholders 208,345 208,437 204,116
Coinsurance deposits $ 25,729 $ 4,885 $ (122,415)