COMMITMENTS AND CONTINGENCIES (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Aggregate amount of contingent litigation liabilities	$ 5,000,000
Maximum recommend total restitution	450,000
Self-insurance liabilities related to workers' compensation, vehicular liabilities, and general liability claims recorded	53,800,000	$ 58,700,000
Insurance receivables which partially offset self-insurance liabilities	16,500,000	16,300,000
Environmental remediation liabilities recorded	$ 2,200,000	$ 3,400,000