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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 30, 2018
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 280,385 $ 284,625
Less discount on workers’ compensation reserve 18,319 18,179
Workers' compensation reserve, net of discount 262,066 266,446
Less current portion 74,073 76,421
Long-term portion $ 187,993 $ 190,025