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Supplemental Financial Information (Schedule Of Accrued Payroll And Benefits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Workers' compensation liability $ 30,878 $ 34,631
Accrued payroll 35,622 19,666
Other accrued payroll and benefits 46,967 28,244
Accrued payroll and benefits, Current, Total $ 113,467 $ 82,541