COMMITMENTS AND CONTINGENCIES (Other Contingencies) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Product Liability Contingency [Line Items]
Retention for environmental impairment	$ 500,000
Self-insurance liabilities	34,000,000	33,100,000
Weighted average risk free discount rate for self insurance liabilities	1.30%	0.94%
2015	13,816,000
2016	8,600,000
2017	6,672,000
2018	2,637,000
2019	1,858,000
Thereafter	1,150,000
Undiscounted self-insurance liabilities	34,733,000
Less: Discount	751,000
Total self-insurance liabilities (included in accrued expenses)	33,982,000
Minimum
Product Liability Contingency [Line Items]
Deductible health insurance policy	300,000
Safety-Kleen
Product Liability Contingency [Line Items]
Deductible per occurrence for workers compensation	1,000,000
Deductible per occurrence for general liability	2,000,000
Deductible per occurrence for vehicle liability	$ 2,000,000