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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Investment related gains (losses), net | $ (88,235) |  | $ 22,564 |  | $ (90,166) | $ 226,835 |
Investment income | 389,597 |  | 447,106 |  | 1,267,027 | 1,262,088 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 140,137 |  | 231,815 |  | 538,052 | 731,790 |
Income Tax Expense (Benefit) | (56,603) |  | (73,819) |  | (199,013) | (238,834) |
Net income | 83,534 |  | 157,996 |  | 339,039 | 492,956 |
Unrealized Appreciation Depreciation Of Investments [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | (40,982) |  | (1,626) |  | (34,790) | 36,035 |
Income Tax Expense (Benefit) | 13,948 |  | 588 |  | 13,410 | (12,374) |
Net income | (27,034) |  | (1,038) |  | (21,380) | 23,661 |
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 | (31,506) |  | 2,218 |  | (26,598) | 30,549 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 179 |  | 0 |  | 834 | 0 |
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 | (112) |  | 393 |  | 491 | 932 |
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 | (9,543) | [1] | (4,237) | [1] | 9,517 | 4,554 | [1]
Amortization Of Unrealized Pension And Postretirement Benefits [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | (2,037) |  | (1,064) |  | (4,002) | (2,634) |
Income Tax Expense (Benefit) | 713 |  | 372 |  | 1,401 | 922 |
Net income | (1,324) |  | (692) |  | (2,601) | (1,712) |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Net income | (28,358) |  | (1,730) |  | (23,981) | 21,949 |
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 | (82) | [2] | (214) | [2] | (245) | (432) | [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) | $ (1,955) | [2] | $ (850) | [2] | $ 3,757 | $ (2,202) | [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 2014 Annual Report for additional details.
[2] | These AOCI components are included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.

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