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OTHER ACCRUED LIABILITIES - Changes in Product Warranty Accrual (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 22,247 $ 20,132
Provision for warranties issued in current year 5,253 5,272
Payments (3,158) (3,939)
Balance at end of period $ 24,342 $ 21,465