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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2011
Derivative Instruments  
Derivative Instruments Fair Value
   Asset Derivatives  Liability Derivatives
   2011 2010 2011 2010
   Balance     Balance     Balance     Balance    
   Sheet Fair  Sheet  Fair Sheet  Fair Sheet  Fair
    Location Value Location  Value Location  Value Location  Value
                      
Derivatives                     
 designated as  Other    Other     Other    Other   
 hedging  assets,    assets,    long-term    long-term   
 instruments  net $ - net $ - liabilities $ - liabilities $ 902