REMEDIAL LIABILITIES (Additional Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 sites	Dec. 31, 2012
Environmental Remediation Obligations [Abstract]
Number of sites		2
Accrued remedial liabilities	$ 155,121,000	$ 172,498,000	$ 183,346,000
Possible increase in total remedial liabilities	$ 25,800,000
Accrual for environmental loss contingencies, threshold for disclosure	5.00%