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Income Taxes - Changes to Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes to gross unrecognized tax benefits:      
Balance at beginning of period $ 3,020 $ 4,094 $ 4,040
Additions as a result of tax provisions taken during the current year 226 274 473
Foreign currency translation   (20)  
Foreign currency translation (13)   (100)
Lapse in statute of limitations 0 (51) (92)
Settlements (232) 0 (227)
Other 0 (1,317) 0
Balance at end of period $ 3,001 $ 3,020 $ 4,094