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WARRANTIES - Changes in Product Warranty Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balances at beginning of period $ 6,072 $ 3,263 $ 6,413 $ 2,084
Warranty acquired in business combinations   3,618   4,818
Increases to accruals 1,097 286 2,608 890
Warranty expenditures (1,458) (414) (3,325) (1,045)
Effect of changes in exchange rates 10 (11) 25 (5)
Balances at end of period $ 5,721 $ 6,742 $ 5,721 $ 6,742