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Investments and Other Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2011
Investment and Other Marketable Securities [Abstract]  
Summary of Company's available-for-sale securities on hand
                         
    Cost     Gross
Unrealized
Losses
    Estimated
Fair
Value
 

Marketable securities

  $ 24,819     $ (4,975   $ 19,844  
   

 

 

   

 

 

   

 

 

 
    $ 24,819     $ (4,975   $ 19,844