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Supplemental Consolidated Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other current liabilities    
Accrued self-insurance reserves $ 2,799 $ 1,422
Other accrued expenses and current liabilities 1,515 1,561
Total other current liabilities $ 4,314 $ 2,983