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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Investment related gains (losses), net $ (9,312) $ 23,043 $ (17,004) $ 160,451
Investment income 572,742 556,918 1,617,132 1,589,820
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 322,661 340,162 707,874 887,321
Income Tax Expense (Benefit) (21,462) (112,571) (102,071) (282,028)
Net income 301,199 227,591 605,803 605,293
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 (25,858) 12,085 (79,505) 51,407
Income Tax Expense (Benefit) 5,355 (3,991) 16,978 (16,015)
Net income (20,503) 8,094 (62,527) 35,392
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 (21,249) 10,515 (60,347) 39,032
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] 234 0 (108) 0
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] 50 230 270 560
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] 0 224 0 286
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 (4,893) [1] 1,116 [1] 19,320 [2] 11,529 [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 (1,620) (1,071) (3,986) (4,006)
Income Tax Expense (Benefit) 340 375 837 1,402
Net income (1,280) (696) (3,149) (2,604)
Amounts Reclassified From AOCI [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net income (21,783) 7,398 (65,676) 32,788
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 246 [2] 590 [2] 739 [3] 732 [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) $ (1,866) [2] $ (1,661) [2] $ 4,725 [3] $ (4,738) [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 2017 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.