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OTHER ACCRUED LIABILITIES - Changes in Product Warranty Accrual (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 20,570 $ 22,575
Provision for warranties issued in current year 1,397 973
Payments (1,309) (1,203)
Balance at end of period $ 20,658 $ 22,345