COMMITMENTS AND CONTINGENCIES (Other Contingencies) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Product Liability Contingency [Line Items]
Retention for environmental impairment	$ 1,000
Self-insurance liabilities	$ 34,800	$ 34,000
Weighted average risk free discount rate for self insurance liabilities	1.29%	1.28%
Self Insurance Losses Expected [Abstract]
2016	$ 14,735
2017	7,383
2018	4,948
2019	3,539
2020	1,829
Thereafter	3,109
Undiscounted self-insurance liabilities	35,543
Less: Discount	732
Total self-insurance liabilities (included in accrued expenses)	34,811
Minimum
Product Liability Contingency [Line Items]
Deductible health insurance policy	300
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