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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other investment related gains (losses), net |  |  |  |  |  |  |  |  |  | $ (141,594) | $ 210,519 | $ 132,926
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 0 | 0 | (74)
Investment income, net of related expenses |  |  |  |  |  |  |  |  |  | 2,138,525 | 2,154,651 | 1,911,886
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) |  |  |  |  |  |  |  |  |  | (26,608) | 8,220 | 3,541
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  |  |  |  |  |  |  |  |  | 947 | (11,717) | (444)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  |  |  |  |  |  |  |  |  | (1,063) | 10,587 | (4,427)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | $ 137,946 | $ 322,661 | $ 247,288 | $ 137,925 | $ 255,494 | $ 340,162 | $ 339,315 | $ 207,844 | 845,820 | 1,142,815 | 1,043,946
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (129,978) | 679,366 | (342,503)
Net Income (Loss) Attributable to Parent |  | $ 110,039 | $ 301,199 | $ 204,374 | $ 100,230 | $ 1,216,888 | $ 227,591 | $ 232,190 | $ 145,512 | 715,842 | 1,822,181 | $ 701,443
Amortization Of Unrealized Pension And Postretirement Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | [1] |  |  |  |  |  |  |  |  | 971 | (971) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | [1] |  |  |  |  |  |  |  |  | (6,305) | (6,374) |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (5,334) | (5,403) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 1,176 | 1,891 |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | (4,158) | (3,512) |
Unrealized Appreciation Depreciation Of Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other investment related gains (losses), net |  |  |  |  |  |  |  |  |  | (122,221) | 25,039 |
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) | [2] |  |  |  |  |  |  |  |  | (26,608) | 8,220 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (148,354) | 34,460 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 31,208 | (10,308) |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | (117,146) | 24,152 |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | (121,304) | 20,640 |
Interest Rate Options [Member] | Unrealized Gains Losses On Available For Sale Securities [Member] | Unrealized Appreciation Depreciation Of Investments [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] |  |  |  |  |  |  |  |  | 183 | (79) |
Currency Swap [Member] | Unrealized Gains Losses On Available For Sale Securities [Member] | Unrealized Appreciation Depreciation Of Investments [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] |  |  |  |  |  |  |  |  | 292 | 380 |
Forward Contracts [Member] | Unrealized Gains Losses On Available For Sale Securities [Member] | Unrealized Appreciation Depreciation Of Investments [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] |  |  |  |  |  |  |  |  | $ 0 | $ 900 |
[1] | See Note 10 for information on employee benefit plans.
[2] | See Note 8 for information on deferred policy acquisition costs.
[3] | See Note 5 for information on cash flow hedges.

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