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Accumulated Other Comprehensive Income (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Investment related gains (losses), net $ 58,352 $ 25,598 $ 152,925 $ 83,946
Investment income 444,234 328,334 869,365 669,274
Total before tax (74,758) 215,892 204,069 396,655
Tax (expense) benefit 25,146 (74,781) (68,146) (132,226)
Net income (loss) (49,612) 141,111 135,923 264,429
Unrealized Appreciation Depreciation Of Investments [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 428   9,533  
Tax (expense) benefit (87)   (3,021)  
Net income (loss) 341   6,512  
Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Investment related gains (losses), net 13,510   23,858  
Unrealized Appreciation Depreciation Of Investments [Member] | Gains Losses On Qualifying Cash Flow Hedging Instruments [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Investment income 201   506  
Unrealized Appreciation Depreciation Of Investments [Member] | DAC Attributed To Unrealized Gains Losses [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Deferred policy acquisition costs attributed to unrealized gains and losses (13,283) [1]   (14,831) [1]  
Amortization Of Unrealized Pension And Postretirement Benefits [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before tax (1,181)   (2,298)  
Tax (expense) benefit 413   804  
Net income (loss) (768)   (1,494)  
Amounts Reclassified From AOCI [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net income (loss) (427)   5,018  
Prior Service Cost [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Prior service cost (213) [2]   (307) [2]  
Actuarial Gains Losses [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Actuarial gains/(losses) $ (968) [2]   $ (1,991) [2]  
[1] This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2012 Annual Report for additional details.
[2] These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details.