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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Investment related gains (losses), net $ (470) $ 77,712
Investment income 516,329 514,364
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 137,925 207,844
Income Tax Expense (Benefit) (37,695) (62,332)
Net income 100,230 145,512
Unrealized Appreciation Depreciation Of Investments [Member]    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Investment related gains (losses), net (14,456) (11,857)
Deferred policy acquisition costs attributed to unrealized gains and losses (6,592) 5,848
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (21,274) (5,762)
Income Tax Expense (Benefit) 4,678 3,194
Net income (16,596) (2,568)
Amortization Of Unrealized Pension And Postretirement Benefits [Member]    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Prior service cost 246 82
Actuarial gains/(losses) (1,592) (1,538)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (1,346) (1,456)
Income Tax Expense (Benefit) 283 510
Net income (1,063) (946)
Amounts Reclassified From AOCI [Member]    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net income (17,659) (3,514)
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 (370) 0
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 144 197
Forward Contracts [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 $ 0 $ 50