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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Investment related gains (losses), net |  | $ 12,472 | $ (7,222) | $ 29,713 | $ (7,692)
Investment income |  | 584,078 | 528,061 | 1,163,955 | 1,044,390
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | 260,077 | 247,288 | 476,641 | 385,213
Income Tax Expense (Benefit) |  | (57,379) | (42,914) | (104,436) | (80,609)
Net income |  | 202,698 | 204,374 | 372,205 | 304,604
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 |  | 83,808 | (32,372) | 98,502 | (53,646)
Income Tax Expense (Benefit) |  | (17,273) | 6,945 | (20,279) | 11,623
Net income |  | 66,535 | (25,427) | 78,223 | (42,023)
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 |  | 20,249 | (24,642) | 19,976 | (39,098)
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] | 383 | 29 | 852 | (342)
Unrealized Appreciation Depreciation Of Investments [Member] | Currency 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] | (6) | 76 | 19 | 221
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 | [2] | 63,182 | (7,835) | (77,655) | (14,427)
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 |  | (1,607) | (1,020) | (2,893) | (2,366)
Income Tax Expense (Benefit) |  | 338 | 214 | 608 | 497
Net income |  | (1,269) | (806) | (2,285) | (1,869)
Amounts Reclassified From AOCI [Member] |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net income |  | 65,266 | (26,233) | 75,938 | (43,892)
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 | [3] | 268 | 247 | 537 | 493
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) | [3] | $ (1,875) | $ (1,267) | $ 3,430 | $ (2,859)
[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 2018 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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