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Details of Certain Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Details Of Certain Balance Sheet Accounts [Abstract]    
Prepaid workers’ compensation and liability insurance $ 2,782 $ 2,838
Workers' compensation insurance receivable 1,860 1,860
Health insurance receivable 1,108 528
Other 6,990 4,743
Total prepaid expenses and other current assets $ 12,740 $ 9,969