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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative assets $ 1,290,387 $ 1,568,380
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,292,756 1,568,795
Derivative liabilities 8,947,193 8,791,216
Call Options | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,290,387 1,568,380
Interest Rate Caps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,244 415
Interest Rate Swap | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,125 0
Derivative liabilities 0 789
Fixed Index Annuities - Embedded Derivatives | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 8,947,193 $ 8,790,427