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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net loss $ (7,810) $ (4,687)
Other comprehensive income (loss):    
Foreign currency translation adjustments 1,700 (543)
Derivatives qualifying as hedges, net of tax:    
Loss on derivative instruments designated and qualifying as cash flow hedges (206) (572)
Amounts reclassified from accumulated other comprehensive loss to net loss 809 139
Derivatives qualifying as hedges, net of tax 603 (433)
Defined benefit pension plans, net of tax:    
Net (loss) gain (2,785) 1,258
Amounts reclassified from accumulated other comprehensive loss to net loss 105 561
Defined benefit pension plans, net of tax (2,680) 1,819
Other comprehensive (loss) income (377) 843
Comprehensive loss $ (8,187) $ (3,844)