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WARRANTIES - Changes in Product Warranty Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balances at beginning of period $ 4,780 $ 6,413
Increases to accruals 780 758
Warranty expenditures (1,051) (856)
Effect of changes in exchange rates (5)  
Balances at end of period $ 4,504 $ 6,315