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Accumulated Other Comprehensive Loss - Rollforward of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 334,619 $ 147,431 $ 52,167
Other comprehensive (loss) income, before taxes (2,305) 5,284 (10,812)
Tax expense (benefit) (1) 203 (62)
Total other comprehensive income (loss), net of taxes (2,306) 5,487 (10,874)
Ending balance 341,599 334,619 147,431
Accumulated Foreign Currency Adjustment Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (22,908) (28,867) (17,847)
Other comprehensive (loss) income, before taxes (2,311) 5,959 (11,020)
Tax expense (benefit) 0 0 0
Total other comprehensive income (loss), net of taxes (2,311) 5,959 (11,020)
Ending balance (25,219) (22,908) (28,867)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (1,019) (547) (693)
Other comprehensive (loss) income, before taxes 6 (675) 208
Tax expense (benefit) (1) 203 (62)
Total other comprehensive income (loss), net of taxes 5 (472) 146
Ending balance (1,014) (1,019) (547)
Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (23,927) (29,414) (18,540)
Total other comprehensive income (loss), net of taxes (2,306) 5,487 (10,874)
Ending balance $ (26,233) $ (23,927) $ (29,414)