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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Coinsurance [Line Items]      
Annuity product charges $ 89,006 $ 76,189 $ 69,075
Change in fair value of derivatives 221,138 (114,728) 168,862
Interest Sensitive And Index Product Benefits 818,087 775,757 733,218
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net 286,899 (105,194) 130,950
Other Cost and Expense, Operating 95,495 67,529 114,615
Return of annuity policyholder account balances (1,575,340) (1,494,554) (1,465,434)
Proceeds from Payments to Coinsurance Deposits 4,885 (122,415) (267,638)
Coinsurance Agreements, EquiTrust Life Insurance Company and Athene Life Re Ltd. Company [Member]
      
Coinsurance [Line Items]      
Annuity product charges 6,796 8,149 9,063
Change in fair value of derivatives 17,106 (2,771) 19,408
Coinsurance, Revenues Included in Consolidated Statement of Operations 23,902 5,378 28,471
Interest Sensitive And Index Product Benefits 94,113 99,724 96,872
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net 9,373 (12,428) 3,373
Other Cost and Expense, Operating 9,333 8,970 8,948
Coinsurance, Benefits and Expenses Included in the Consolidated Statement of Operations 112,819 96,266 109,193
Annuity Deposits, Coinsurance (203,552) (326,531) (478,962)
Return of annuity policyholder account balances $ (208,437) $ (204,116) $ (211,324)