COMMITMENTS AND CONTINGENCIES (Other Contingencies) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Product Liability Contingency [Line Items]
Retention for environmental impairment	$ 1,000
Self-insurance liabilities	$ 46,500	$ 42,500
Weighted average risk free discount rate for self insurance liabilities	1.16%	1.29%
Self Insurance Losses Expected [Abstract]
2017	$ 17,827
2018	10,286
2019	7,559
2020	4,552
2021	3,978
Thereafter	3,269
Undiscounted self-insurance liabilities	47,471
Less: Discount	941
Total self-insurance liabilities (included in accrued expenses)	46,530
Minimum
Product Liability Contingency [Line Items]
Deductible health insurance policy	600
Safety-Kleen
Product Liability Contingency [Line Items]
Deductible per occurrence for workers compensation	1,000
Deductible per occurrence for general liability	2,000
Deductible per occurrence for vehicle liability	$ 2,000