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WARRANTIES - Changes in Product Warranty Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balances at beginning of period $ 6,315 $ 2,264 $ 6,413 $ 2,084
Warranty acquired in business combinations   1,200   1,200
Increases to accruals 753 85 1,511 604
Warranty expenditures (1,011) (286) (1,867) (631)
Effect of changes in exchange rates 15   15 6
Balances at end of period $ 6,072 $ 3,263 $ 6,072 $ 3,263