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OTHER FINANCIAL INFORMATION - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Salaries, commissions, incentive compensation and benefits $ 9,200 $ 5,524
Customer rebates and sales incentives 21,601 24,198
Freight 3,734 4,908
Operating lease liabilities, current 3,511 3,170
Other 11,771 9,292
Total accrued liabilities $ 49,817 $ 47,092