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Available for Sale Securities and Certificate of Deposit (Tables)
6 Months Ended
Jun. 30, 2012
Available for Sale Securities and Certificate of Deposit [Abstract]  
Summary of available-for-sale securities classified as current assets
                                                 
    June 30, 2012     December 31, 2011  
    Cost
Basis
    Gross
Unrealized
Gain
    Fair
Value
    Cost
Basis
    Gross
Unrealized
Gain
    Fair
Value
 

Common stock investment

  $ —       $ —       $ —       $ 117     $ 48     $ 165