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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 284,625 $ 293,600
Less discount on workers' compensation reserve 18,179 19,277
Workers' compensation reserve, net of discount 266,446 274,323
Less current portion 76,421 77,218
Long-term portion $ 190,025 $ 197,105