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Derivative Financial Instruments (Schedule Of Derivative Gains And Losses In The Statements Of Operations) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Interest Rate Contract [Member] | Interest Expense [Member] | Fair Value Hedges [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income$ (887)$ (1,828)$ (4,470)$ (5,310)
Interest Rate Contract [Member] | Other Revenue [Member] | Not Designated As Hedging Instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income521(83)1,384(936)
Interest Rate Contract [Member] | Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income141(111)310(420)
Equity Contracts [Member] | Net Realized Investment Gains [Member] | Not Designated As Hedging Instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income2,8239827,5574,276
Not Designated As Hedging Instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income$ 3,344$ 899$ 8,941$ 3,340