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Accumulated Other Comprehensive Loss - Rollforward of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 341,599 $ 334,619
Other comprehensive (loss) income, before taxes (9,153) (5,069)
Tax expense (benefit) (8) (7)
Total other comprehensive loss, net of taxes (9,161) (5,076)
Ending balance 353,997 351,010
Accumulated Foreign Currency Adjustment Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (25,219) (22,908)
Other comprehensive (loss) income, before taxes (9,182) (5,085)
Tax expense (benefit) 0 0
Total other comprehensive loss, net of taxes (9,182) (5,085)
Ending balance (34,401) (27,993)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (1,014) (1,019)
Other comprehensive (loss) income, before taxes 29 16
Tax expense (benefit) (8) (7)
Total other comprehensive loss, net of taxes 21 9
Ending balance (993) (1,010)
Accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (26,233) (23,927)
Total other comprehensive loss, net of taxes (9,161) (5,076)
Ending balance $ (35,394) $ (29,003)