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Supplemental Balance Sheet Information (Schedule Of Accrued Payroll And Benefits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Supplemental Balance Sheet Information [Abstract]    
Workers' compensation liability $ 27,456 $ 27,630
Accrued payroll and bonuses 107,799 79,702
Accrued employer payroll taxes, deferred pursuant to the CARES Act 0 70,812
Other accrued payroll and benefits 27,150 24,910
Accrued payroll and benefits $ 162,405 $ 203,054