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Investments - Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2011
Investments - Marketable Securities [Abstract]  
Summary Of The Cost And Fair Value Of Investments In Marketable Securities
     2010      2011  

Cost

   $ 12,346       $   –   

Gross unrealized gain

     40           
  

 

 

    

 

 

 

Fair value

   $ 12,386       $   –