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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.