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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ 119,110 |  | $ (12,041) |  | $ 32,041 |  | $ (1,931) |
Investment income |  | 507,666 |  | 450,539 |  | 924,932 |  | 877,430 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | 353,223 |  | 213,790 |  | 460,803 |  | 397,915 |
Income Tax Expense (Benefit) |  | (117,120) |  | (83,399) |  | (148,228) |  | (142,410) |
Net income |  | 236,103 |  | 130,391 |  | 312,575 |  | 255,505 |
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, Noncontrolling Interest |  | 34,603 |  | (440) |  | 24,366 |  | 6,192 |
Income Tax Expense (Benefit) |  | (9,646) |  | (245) |  | (4,996) |  | (537) |
Net income |  | 24,957 |  | (685) |  | 19,370 |  | 5,655 |
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 |  | 30,190 |  | 1,829 |  | 11,899 |  | 4,908 |
Unrealized Appreciation Depreciation Of Investments [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1] | 93 |  | 231 |  | 253 |  | 291 |
Unrealized Appreciation Depreciation Of Investments [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1] | (1,045) |  | 1,807 |  | (257) |  | 967 |
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 |  | 5,365 | [1] | (4,307) | [1] | (12,471) | [2] | 26 | [2]
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, Noncontrolling Interest |  | (1,916) |  | (1,178) |  | (3,467) |  | (1,965) |
Income Tax Expense (Benefit) |  | 670 |  | 413 |  | 1,213 |  | 688 |
Net income |  | (1,246) |  | (765) |  | (2,254) |  | (1,277) |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Net income |  | 23,711 |  | (1,450) |  | 17,116 |  | 4,378 |
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 |  | (75) | [2] | (80) | [2] | (153) | [3] | (163) | [3]
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) |  | $ (1,841) | [2] | $ (1,098) | [2] | $ 3,314 | [3] | $ (1,802) | [3]
[1] | See Note 5 - "Derivative Instruments" for additional information on cash flow hedges.
[2] | This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2015 Annual Report for additional details.
[3] | This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.

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