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OTHER ACCRUED LIABILITIES Product Warranty Accrual Included in Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 22,247 $ 20,132
Provision for warranties issued in current year 1,948 1,524
Payments (1,183) (1,353)
Balance at end of period $ 23,012 $ 20,303