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Supplemental Balance Sheet Information (Schedule Of Accrued Payroll And Benefits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Supplemental Balance Sheet Information [Abstract]    
Workers' compensation liability $ 27,630 $ 29,837
Accrued payroll 41,784 31,188
Accrued employer payroll taxes, deferred pursuant to the CARES Act 70,812 0
Other accrued payroll and benefits 62,828 65,575
Accrued payroll and benefits $ 203,054 $ 126,600