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WARRANTIES - Changes in Product Warranty Obligation (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Balance at beginning of period $ 4,780
Increases to accruals 1,520
Warranty expenditures (2,253)
Effect of changes in exchange rates (2)
Balance at end of period $ 4,045