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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Jul. 02, 2017
Jan. 01, 2017
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 293,927 $ 292,169
Less discount on workers’ compensation reserve 15,810 14,818
Workers' compensation reserve, net of discount 278,117 277,351
Less current portion 75,410 79,126
Long-term portion $ 202,707 $ 198,225