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Details of Certain Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Details Of Certain Balance Sheet Accounts [Abstract]    
Prepaid workers’ compensation and liability insurance $ 2,838 $ 2,040
Workers’ compensation insurance receivable 1,860 1,989
Health insurance receivable 528 1,567
Other 4,743 2,397
Total prepaid expenses and other current assets $ 9,969 $ 7,993