SIGNIFICANT ACCOUNTING POLICIES (Remedial Liabilities) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) site	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Regulatory Liabilities [Line Items]
Accrual for environmental loss contingencies | $	$ 131,992	$ 155,121	$ 172,498
Period of time in years over which business acquisitions have been acquired	14 years
Superfund sites owned by third parties	35
Superfund sites	128
Minimum
Regulatory Liabilities [Line Items]
Remedial liabilities at acquisition	1.01%
Remedial liabilities discounted risk free interest rate	2.88%
Maximum
Regulatory Liabilities [Line Items]
Remedial liabilities at acquisition	2.57%
Remedial liabilities discounted risk free interest rate	5.99%