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Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities $ 12,546 $ 15,926
Fixed income available-for-sale securities 59,749 59,943
Fixed income securities owned 21,107 20,088
Trading securities 5,853 5,909
Assets, fair value 99,255 101,866
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 12,546 15,926
Fixed income available-for-sale securities 0 0
Fixed income securities owned 0 0
Trading securities 4,691 4,706
Assets, fair value 17,237 20,632
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 59,749 59,943
Fixed income securities owned 21,107 20,088
Trading securities 0 0
Assets, fair value 80,856 80,031
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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 1,162 1,203
Assets, fair value $ 1,162 $ 1,203