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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]            
Standard product warranty accrual $ 25,065 $ 23,767 $ 23,743 $ 21,578 $ 22,090 $ 22,015