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Supplemental Consolidated Financial Statement Information - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other current liabilities    
Accrued self-insurance reserves $ 2,423 $ 2,799
Other accrued expenses and current liabilities 1,220 1,515
Total other current liabilities $ 3,643 $ 4,314