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Supplemental Balance Sheet Information (Schedule Of Accrued Payroll And Benefits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Supplemental Balance Sheet Information [Abstract]    
Workers' compensation liability $ 29,837 $ 30,878
Accrued payroll 31,188 35,622
Other accrued payroll and benefits 65,575 46,967
Accrued payroll and benefits $ 126,600 $ 113,467