Details of Certain Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Details Of Certain Balance Sheet Accounts [Abstract]
Prepaid payroll taxes	$ 2,256
Prepaid workers' compensation and liability insurance	1,969	$ 2,838
Workers' compensation insurance receivable	1,748	1,860
Income tax receivable	1,614
Health insurance receivable	565	528
Other	5,362	4,743
Total prepaid expenses and other current assets	$ 13,514	$ 9,969

Details Of Certain Balance Sheet Accounts Abstract

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Prepaid Workers Compensation And Liability Insurance Current

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Workers' compensation insurance receivable

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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