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Comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension Liability Adjustment, Other comprehensive income (loss):    
Pension Liability Adjustment, Balance at Beginning of the Period $ 1,387 $ 1,523
Pension Liability Adjustment, Other comprehensive income (loss) before reclassifications, net of taxes 0 0
Pension Liability Adjustment, Total other comprehensive income (loss) before reclassifications, net of taxes 1,387 1,523
Pension Liability Adjustment, Net amount reclassified to earnings (196) (136)
Pension Liability Adjustment, Balance at End of the Period 1,191 1,387
Fair Value of Derivatives, Other comprehensive income (loss):    
Fair Value of Derivatives, Balance at Beginning of the Period (318) (165)
Fair Value of Derivatives, Other comprehensive income (loss) before reclassifications, net of taxes 574 (90)
Fair Value of Derivatives, Total other comprehensive income (loss) before reclassifications, net of taxes 256 (255)
Fair Value of Derivatives, Net amount reclassified to earnings 86 (63)
Fair Value of Derivatives, Balance at End of the Period 342 (318)
Foreign Currency Translation Adjustment, Other comprehensive income (loss):    
Foreign Currency Translation Adjustment, Balance at Beginning of the Period (1,393) (1,442)
Foreign Currency Translation Adjustment, Other comprehensive income (loss) before reclassifications, net of taxes 706 49
Foreign Currency Translation Adjustment, Total other comprehensive income (loss) before reclassifications, net of taxes (687) (1,393)
Foreign Currency Translation Adjustment, Net amount reclassified to earnings 0 0
Foreign Currency Translation Adjustment, Balance at End of the period (687) (1,393)
Accumulated Other Comprehensive Income (loss), Other comprehensive income (loss):    
Accumulated Other Comprehensive Income (loss), Balance at Beginning of the period (324) (84)
Accumulated Other Comprehensive Income (loss), Other comprehensive income (loss) before reclassifications, net of taxes 1,280 (41)
Accumulated Other Comprehensive Income (loss), Total other comprehensive income (loss) before reclassifications, net of taxes 956 (125)
Accumulated Other Comprehensive Income (loss), Net amount reclassified to earnings (110) (199)
Accumulated Other Comprehensive Income (loss), Balance at End of the period $ 846 $ (324)