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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional Amount $ 14,242,418 $ 11,928,989
Carrying Value / Fair Value of Assets 363,772 301,270
Derivative Liability, Fair Value, Gross Liability 1,225,050 1,202,203
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount 12,870,134 10,985,503
Carrying Value / Fair Value of Assets 261,105 155,005
Derivative Liability, Fair Value, Gross Liability 1,182,539 1,172,217
Not Designated as Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 1,062,745 1,123,057
Carrying Value / Fair Value of Assets 175,123 85,075
Derivative Liability, Fair Value, Gross Liability 821 4,196
Not Designated as Hedging Instrument | Financial Futures    
Derivative [Line Items]    
Notional Amount 552,384 420,665
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 30,000 45,000
Carrying Value / Fair Value of Assets 173 44
Derivative Liability, Fair Value, Gross Liability 2,733 6,768
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Derivative [Line Items]    
Notional Amount 30,043 28,561
Carrying Value / Fair Value of Assets 13 0
Derivative Liability, Fair Value, Gross Liability 460 292
Not Designated as Hedging Instrument | Credit Default Swaps    
Derivative [Line Items]    
Notional Amount 909,000 897,000
Carrying Value / Fair Value of Assets 10,605 8,230
Derivative Liability, Fair Value, Gross Liability 3,430 11,053
Not Designated as Hedging Instrument | Equity Options    
Derivative [Line Items]    
Notional Amount 610,792 453,435
Carrying Value / Fair Value of Assets 48,162 46,653
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Longevity Swap [Member]    
Derivative [Line Items]    
Notional Amount 898,800 868,960
Carrying Value / Fair Value of Assets 27,029 15,003
Derivative Liability, Fair Value, Gross Liability 0 7
Not Designated as Hedging Instrument | Mortality Swap [Member]    
Derivative [Line Items]    
Notional Amount 50,000 50,000
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 2,068 2,619
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 42,903 76,698
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 854,564 878,114
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 275,560 192,470
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts    
Derivative [Line Items]    
Notional Amount 8,726,370 7,098,825
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument    
Derivative [Line Items]    
Notional Amount 1,372,284 943,486
Carrying Value / Fair Value of Assets 102,667 146,265
Derivative Liability, Fair Value, Gross Liability 42,511 29,986
Designated As Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 435,000 120,000
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 41,306 29,986
Designated As Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 937,284 823,486
Carrying Value / Fair Value of Assets 102,667 146,265
Derivative Liability, Fair Value, Gross Liability $ 1,205 $ 0