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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 293,600 $ 292,169
Less discount on workers' compensation reserve 19,277 14,818
Workers' compensation reserve, net of discount 274,323 277,351
Less current portion 77,218 79,126
Long-term portion $ 197,105 $ 198,225