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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Investment related gains (losses), net | $ (12,041) |  | $ 119,397 |  | $ (1,931) | $ 204,271 |
Investment income | 450,539 |  | 410,607 |  | 877,430 | 814,982 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 2,038 |  |  |  | 1,258 |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 213,790 |  | 300,535 |  | 397,915 | 499,975 |
Income Tax Expense (Benefit) | (83,399) |  | (102,239) |  | (142,410) | (165,015) |
Net income | 130,391 |  | 198,296 |  | 255,505 | 334,960 |
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 | (440) |  | 31,833 |  | 6,192 | 37,661 |
Income Tax Expense (Benefit) | (245) |  | (11,059) |  | (537) | (12,963) |
Net income | (685) |  | 20,774 |  | 5,655 | 24,698 |
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 | 1,829 |  | 27,142 |  | 4,908 | 28,331 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1,495 |  | 0 |  | 655 | 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 | 543 |  | 321 |  | 603 | 539 |
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 | (4,307) | [1] | 4,370 | [1] | (26) | 8,791 | [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 | (1,178) |  | (678) |  | (1,965) | (1,570) |
Income Tax Expense (Benefit) | 413 |  | 238 |  | 688 | 550 |
Net income | (765) |  | (440) |  | (1,277) | (1,020) |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Net income | (1,450) |  | 20,334 |  | 4,378 | 23,678 |
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 | (80) | [2] | (216) | [2] | (163) | (218) | [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) | $ (1,098) | [2] | $ (462) | [2] | $ 1,802 | $ (1,352) | [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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