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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 28,717 $ 31,898
Property taxes 3,657 3,405
Customer incentives 12,297 10,318
Accrued interest 7,460 1,232
Other 5,902 12,349
Total accrued liabilities $ 58,033 $ 59,202