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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Payables and Accruals [Abstract]    
Current portion of lease liability $ 13,176 $ 13,108
Accrued vacation 12,921 10,048
Payroll and related taxes 11,683 12,146
Benefits 3,320 4,637
Unrecognized tax benefits 887 887
Professional liability reserve 1,060 1,083
Other 6,750 5,523
Total $ 49,797 $ 47,432