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Comprehensive loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Liability Adjustment, Other comprehensive income (loss):    
Pension Liability Adjustment, Balance at Beginning of the Period $ 1,191 $ 1,387
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 1,191 1,387
Pension Liability Adjustment, Net amount reclassified to earnings 260 (196)
Pension Liability Adjustment, Balance at End of the Period 1,451 1,191
Fair Value of Derivatives, Other comprehensive income (loss):    
Fair Value of Derivatives, Balance at Beginning of the Period 342 (318)
Fair Value of Derivatives, Other comprehensive income (loss) before reclassifications, net of taxes (695) 574
Fair Value of Derivatives, Total other comprehensive income (loss) before reclassifications, net of taxes (353) 256
Fair Value of Derivatives, Net amount reclassified to earnings 353 86
Fair Value of Derivatives, Balance at End of the Period 0 342
Foreign Currency Translation Adjustment, Other comprehensive income (loss):    
Foreign Currency Translation Adjustment, Balance at Beginning of the Period (687) (1,393)
Foreign Currency Translation Adjustment, Other comprehensive income (loss) before reclassifications, net of taxes (779) 706
Foreign Currency Translation Adjustment, Total other comprehensive income (loss) before reclassifications, net of taxes (1,466) (687)
Foreign Currency Translation Adjustment, Net amount reclassified to earnings 0 0
Foreign Currency Translation Adjustment, Balance at End of the period (1,466) (687)
Accumulated Other Comprehensive Income (Loss), Other comprehensive income (loss):    
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of the period 846 (324)
Accumulated Other Comprehensive Income (Loss), Other comprehensive income (loss) before reclassifications, net of taxes (1,474) 1,280
Accumulated Other Comprehensive Income (Loss), Total other comprehensive income (loss) before reclassifications, net of taxes (628) 956
Accumulated Other Comprehensive Income (Loss), Net amount reclassified to earnings 613 (110)
Accumulated Other Comprehensive Income (Loss), Balance at End of the period $ (15) $ 846