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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative assets $ 1,235,125 $ 830,519
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,235,495 831,601
Derivative liabilities 8,070,792 6,565,401
Call Options [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,235,125 830,519
Interest Rate Caps [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 370 1,082
Fixed Index Annuities - Embedded Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 8,069,105 6,563,288
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 1,687 $ 2,113