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PRODUCT WARRANTY COSTS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Changes in the carrying amount of product warranty accruals    
Balance at beginning of year $ 21,760 $ 20,650
Accruals for warranties 7,637 7,835
Settlements (6,603) (6,940)
Foreign currency translation and other adjustments (176) (206)
Balance at end of year $ 22,618 $ 21,339