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Comprehensive income (loss) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Liability Adjustment, Balance $ 95 $ 379  
Pension Liability Adjustment, Current-period change (138) (284) (288)
Pension Liability Adjustment, Balance (43) 95 379
Fair value of Derivatives,Balance (1,122) 823  
Fair value of Derivatives, Current-period change 1,202 (1,945) 4
Fair value of Derivatives, Balance 80 (1,122) 823
Accumulated Other Comprehensive Income (loss), Balance (1,027) 1,202  
Accumulated Other Comprehensive Income (loss), Current-period change 1,064 (2,229)  
Accumulated Other Comprehensive Income (loss), Balance $ 37 $ (1,027) $ 1,202