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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 286,156 $ 293,600
Less discount on workers’ compensation reserve 20,238 19,277
Workers' compensation reserve, net of discount 265,918 274,323
Less current portion 70,950 77,218
Long-term portion $ 194,968 $ 197,105