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Details of Certain Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Details Of Certain Balance Sheet Accounts [Abstract]    
Workers' compensation insurance receivable $ 1,924 $ 1,860
Prepaid workers' compensation and liability insurance 1,875 2,838
Health insurance receivable 1,379 528
Other 5,609 4,743
Total prepaid expenses and other current assets $ 10,787 $ 9,969