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Income Taxes - Changes to Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes to gross unrecognized tax benefits:      
Balance at beginning of period $ 4,094 $ 4,040 $ 5,081
Additions as a result of tax provisions taken during the current year 274 473 702
Foreign currency translation 20    
Foreign currency translation   (100) (51)
Lapse in statute of limitations (51) (92) (80)
Settlements 0 (227) (1,612)
Other (1,317) 0 0
Balance at end of period $ 3,020 $ 4,094 $ 4,040