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Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed income securities owned $ 21,133 $ 20,088
Trading Securities 4,849 5,909
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity available-for-sale securities 11,633 15,926
Fixed income available-for-sale securities 0 0
Fixed income securities owned 0 0
Trading Securities 4,849 4,706
Assets, fair value 16,482 20,632
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity available-for-sale securities 0 0
Fixed income available-for-sale securities 71,690 59,943
Fixed income securities owned 21,133 20,088
Trading Securities 0 0
Assets, fair value 92,823 80,031
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity available-for-sale securities 0 0
Fixed income available-for-sale securities 0 0
Fixed income securities owned 0 0
Trading Securities 0 1,203
Assets, fair value 0 1,203
Estimate of Fair Value Measurement [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity available-for-sale securities 11,633 15,926
Fixed income available-for-sale securities 71,690 59,943
Fixed income securities owned 21,133 20,088
Trading Securities 4,849 5,909
Assets, fair value $ 109,305 $ 101,866