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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Investments, All Other Investments [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

The following table sets forth the liabilities as of March 31, 2013 and December 31, 2012 that the Company measured at fair value, on a recurring basis by level, within the fair value hierarchy (in thousands). 

 
March 31, 2013   Level 1     Level 2     Level 3  
                   
Assets                        
Derivatives   $     $ 111     $  
                         
December 31, 2012     Level 1       Level 2       Level 3  
                         
Assets                        
Derivatives   $     $ 125     $