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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Investment related gains (losses), net |  | $ 17,241 | $ (470)
Investment income |  | 579,877 | 516,329
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | 216,564 | 137,925
Income Tax Expense (Benefit) |  | (47,057) | (37,695)
Net income |  | 169,507 | 100,230
Unrealized Appreciation Depreciation Of Investments [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Investment related gains (losses), net |  | (273) | (14,456)
Deferred policy acquisition costs attributed to unrealized gains and losses | [1] | 14,473 | (6,592)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | 14,694 | (21,274)
Income Tax Expense (Benefit) |  | (3,006) | 4,678
Net income |  | 11,688 | (16,596)
Amortization Of Unrealized Pension And Postretirement Benefits [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Prior service cost | [2] | 269 | 246
Actuarial gains/(losses) | [2] | (1,555) | (1,592)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | (1,286) | (1,346)
Income Tax Expense (Benefit) |  | 270 | 283
Net income |  | (1,016) | (1,063)
Amounts Reclassified From AOCI [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income |  | 10,672 | (17,659)
Interest Rate Options [Member] | 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] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [3] | 469 | (370)
Currency Swap [Member] | 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] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [3] | $ 25 | $ 144
[1] | 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.
[2] | This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.
[3] | See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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