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Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed income securities owned $ 21,158 $ 21,133
Trading securities 5,270 4,849
Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities 12,106 11,633
Fixed income available-for-sale securities 73,398 71,690
Fixed income securities owned 21,158 21,133
Trading securities 5,270 4,849
Assets, fair value 111,932 109,305
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities 12,106 11,633
Fixed income available-for-sale securities 0 0
Fixed income securities owned 0 0
Trading securities 5,270 4,849
Assets, fair value 17,376 16,482
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities 0 0
Fixed income available-for-sale securities 73,398 71,690
Fixed income securities owned 21,158 21,133
Trading securities 0 0
Assets, fair value $ 94,556 $ 92,823