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Income Taxes Deferred Income Taxes, Net, Reconciliation of Gross Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Securities with Other Than Temporary Impairment Losses Recognized Held and Not Deemed Worthless Resulting in a Deferred Tax Asset $ 23,400,000 $ 26,000,000
Components of Deferred Tax Assets [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities 1,698,831,000 1,472,653,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses 8,177,000 9,072,000
Deferred Tax Assets, Derivative Instruments 0 21,429,000
Deferred Tax Assets, Amounts Due on Reinsurance 0 0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves 10,860,000 9,946,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Legal Settlements 7,351,000 0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 14,659,000 15,576,000
Deferred Tax Assets, Operating Loss Carryforwards 16,783,000 14,818,000
Deferred Tax Assets, Other 7,192,000 6,351,000
Deferred Tax Assets, Gross 1,763,853,000 1,549,845,000
Components of Deferred Tax Liabilities [Abstract]    
Deferred Tax Liabilities, Deferred Policy Acquisition Costs and Deferred Sales Inducements (1,425,266,000) (1,266,042,000)
Deferred Tax Liabilities, Unrealized Gain on Available-for-Sale Securities, Gross (357,686,000) (234,066,000)
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs (6,665,000) (10,917,000)
Deferred Tax Liabilities, Derivatives (18,280,000) 0
Deferred Tax Liabilities, Tax Deferred Income (2,588,000) (4,315,000)
Deferred Tax Liabilities, Other (2,671,000) (12,524,000)
Deferred Tax Liabilities (1,813,156,000) (1,527,864,000)
Deferred Tax Assets (Liabilities), Net [Abstract]    
Deferred Tax Assets, Net $ (49,303,000) $ 21,981,000