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Accrued Liabilities and Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued liabilities [Abstract]    
Employee compensation, related taxes and benefits $ 12,628 $ 13,527
Taxes other than income and withholding 8,700 8,677
Self-insurance reserves 6,143 5,962
Other 12,432 9,416
Accrued liabilities 39,903 37,582
Other liabilities [Abstract]    
Straight-line lease liability 7,608 8,565
Self-insurance reserves 2,790 3,013
Other 20,141 15,122
Other liabilities $ 30,539 $ 26,700