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ACCRUED LIABILITIES AND OTHER LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued liabilities [Abstract]    
Employee compensation, related taxes and benefits $ 13,527 $ 15,024
Taxes other than income and withholding 8,677 10,856
Self-insurance reserves 5,962 5,945
Other 9,416 10,079
Accrued liabilities 37,582 41,904
Other liabilities [Abstract]    
Straight-line lease liability 8,565 8,797
Self-insurance reserves 3,013 3,150
Other 15,122 12,724
Other liabilities $ 26,700 $ 24,671