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OTHER ACCRUED LIABILITIES - Changes in Product Warranty Accrual (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 20,570 $ 22,575
Provision for warranties issued in current year 2,652 2,302
Payments (2,237) (2,944)
Balance at end of period $ 20,985 $ 21,933