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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ 59,696 |  | $ 119,110 |  | $ 137,408 |  | $ 32,041 |
Investment income |  | 518,538 |  | 507,666 |  | 1,032,902 |  | 924,932 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | 339,315 |  | 353,223 |  | 547,159 |  | 460,803 |
Income Tax Expense (Benefit) |  | (107,125) |  | (117,120) |  | (169,457) |  | (148,228) |
Net income |  | 232,190 |  | 236,103 |  | 377,702 |  | 312,575 |
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 |  | 45,122 |  | 34,603 |  | 39,360 |  | 24,366 |
Income Tax Expense (Benefit) |  | (15,218) |  | (9,646) |  | (12,024) |  | (4,996) |
Net income |  | 29,904 |  | 24,957 |  | 27,336 |  | 19,370 |
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 |  | 40,374 |  | 30,190 |  | 28,517 |  | 11,899 |
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] | 132 |  | 93 |  | 329 |  | 253 |
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] | 51 |  | (1,045) |  | 101 |  | (257) |
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 |  | 4,565 | [1] | 5,365 | [1] | (10,413) | [2] | 12,471 | [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 |  | (1,479) |  | (1,916) |  | (2,935) |  | (3,467) |
Income Tax Expense (Benefit) |  | 517 |  | 670 |  | 1,027 |  | 1,213 |
Net income |  | (962) |  | (1,246) |  | (1,908) |  | (2,254) |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Net income |  | 28,942 |  | 23,711 |  | 25,428 |  | 17,116 |
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 |  | 60 | [2] | (75) | [2] | 142 | [3] | (153) | [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) |  | $ (1,539) | [2] | $ (1,841) | [2] | $ 3,077 | [3] | $ (3,314) | [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 2016 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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