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WARRANTIES - Changes in Product Warranty Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balances at beginning of period $ 6,413 $ 2,084
Increases to accruals 758 519
Warranty expenditures (856) (345)
Effect of changes in exchange rates   6
Balances at end of period $ 6,315 $ 2,264