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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Oct. 01, 2017
Jan. 01, 2017
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 295,969 $ 292,169
Less discount on workers’ compensation reserve 16,634 14,818
Workers' compensation reserve, net of discount 279,335 277,351
Less current portion 76,406 79,126
Long-term portion $ 202,929 $ 198,225