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Income Taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unrecognized income tax benefits [Rollforward]      
Beginning of year $ 3,750 $ 3,778 $ 5,287
Additions for tax provisions related to the current year     92
Additions for tax positions related to prior years     2
Reductions for tax positions related to prior years (97) (11) (505)
Currency translation adjustment   (4)  
Reductions for settlements   (21) (516)
Lapses of applicable statutes of limitation     (582)
Ending of year $ 3,653 $ 3,750 $ 3,778