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Short - Term Investments (Tables)
12 Months Ended
Dec. 31, 2012
Short-Term Investments [Abstract]  
Summary Of Short-Term Investments Classified As Available For Sale
        Unrealized    
    Amortized   Gains   Fair
    Cost   (Losses)   Value
        ($ in thousands)    
December 31, 2011            
Bank certificate of deposit $ 259 $ - $ 259