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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Investment related gains (losses), net |  | $ 77,712 | $ (87,069)
Investment income |  | 514,364 | 417,266
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | 207,844 | 107,580
Income Tax Expense (Benefit) |  | (62,332) | (31,108)
Net income |  | 145,512 | 76,472
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 |  | (5,762) | (10,237)
Income Tax Expense (Benefit) |  | 3,194 | 4,649
Net income |  | (2,568) | (5,588)
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 |  | (11,857) | (18,291)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1] | 50 | 788
Unrealized Appreciation Depreciation Of Investments [Member] | Gains Losses On Qualifying Cash Flow Hedging Instruments [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Investment income | [1] | 197 | 160
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] | (5,848) | 7,106
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 |  | (1,456) | (1,551)
Income Tax Expense (Benefit) |  | 510 | 543
Net income |  | (946) | (1,008)
Amounts Reclassified From AOCI [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income |  | (3,514) | (6,596)
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] | 82 | (78)
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] | $ 1,538 | $ (1,473)
[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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