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Comprehensive Loss - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance $ 25,239 $ 30,471 $ 26,309 $ 30,566
Balance 25,299 29,945 25,299 29,945
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (1,795) 213 (920) (15)
Other comprehensive income (loss) before reclassifications, net of taxes 221 23 (663) 287
Total other comprehensive income (loss) before reclassifications, net of taxes (1,574) 236 (1,583) 272
Net amount reclassified to earnings 98 (41) 107 (77)
Balance (1,476) 195 (1,476) 195
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (39) 1,415 (53) 1,451
Total other comprehensive income (loss) before reclassifications, net of taxes (39) 1,415 (53) 1,451
Net amount reclassified to earnings 11 (41) 25 (77)
Balance (28) 1,374 (28) 1,374
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (138)   33  
Other comprehensive income (loss) before reclassifications, net of taxes     (166)  
Total other comprehensive income (loss) before reclassifications, net of taxes (138)   (133)  
Net amount reclassified to earnings 87   82  
Balance (51)   (51)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (1,618) (1,202) (900) (1,466)
Other comprehensive income (loss) before reclassifications, net of taxes 221 23 (497) 287
Total other comprehensive income (loss) before reclassifications, net of taxes (1,397) (1,179) (1,397) (1,179)
Balance $ (1,397) $ (1,179) $ (1,397) $ (1,179)