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Comprehensive income (loss) (Tables)
 12 Months Ended
Dec. 31, 2012
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The components of accumulated other comprehensive income (loss) as of December 31, 2012 and 2011, and changes during the periods then ended, are presented below (in thousands):

 

    Pension Liability     Fair Value of     Accumulated Other  
    Adjustment     Derivatives     Comprehensive Income (Loss)  
                   
Balance at January 1, 2011   $ 379     $ 823     $ 1,202  
Current-period change     (284 )     (1,945 )     (2,229 )
Balance at December 31, 2011     95       (1,122 )     (1,027 )
Current-period change     (138 )     1,202       1,064  
Balance at December 31, 2012   $ (43 )   $ 80     $ 37