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Details of Certain Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Details Of Certain Balance Sheet Accounts [Abstract]    
Workers’ compensation insurance receivable $ 1,704 $ 1,692
Prepaid workers’ compensation and liability insurance 1,429 1,840
Health insurance receivable 660 564
Other 5,029 3,002
Prepaid expense and other current assets $ 8,822 $ 7,098