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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Investment related gains (losses), net $ 119,110 $ (12,041) $ 32,041 $ (1,931)
Investment income 507,666 450,539 924,932 877,430
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 353,223 213,790 460,803 397,915
Income Tax Expense (Benefit) (117,120) (83,399) (148,228) (142,410)
Net income 236,103 130,391 312,575 255,505
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 34,603 (440) 24,366 6,192
Income Tax Expense (Benefit) (9,646) (245) (4,996) (537)
Net income 24,957 (685) 19,370 5,655
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 30,190 1,829 11,899 4,908
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] 93 231 253 291
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] (1,045) 1,807 (257) 967
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 5,365 [1] (4,307) [1] (12,471) [2] 26 [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 (1,916) (1,178) (3,467) (1,965)
Income Tax Expense (Benefit) 670 413 1,213 688
Net income (1,246) (765) (2,254) (1,277)
Amounts Reclassified From AOCI [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net income 23,711 (1,450) 17,116 4,378
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 (75) [2] (80) [2] (153) [3] (163) [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) $ (1,841) [2] $ (1,098) [2] $ 3,314 [3] $ (1,802) [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 2015 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.