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WARRANTY ACCRUALS - Changes in Accrual Balance (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Balance at January 1, 2020 $ 0
Assumed liability in connection with ECI Merger 16,251
Current period provisions 3,127
Settlements (4,164)
Balance at September 30, 2020 $ 15,214