COMMITMENTS AND CONTINGENCIES (Superfund Proceedings) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) site facility	Dec. 31, 2002 a
Superfund Proceedings
Number of sites owned by the entity subject to proceedings under federal or state superfund laws	128
Superfund Proceedings
Superfund Proceedings
Number of sites subject to proceedings under federal or state superfund laws	128
Number of sites owned by the entity subject to proceedings under federal or state superfund laws | facility	2
Number of sites owned by third parties subject to proceedings under federal or state superfund laws	126
Number of sites for which environmental remediation expense is settled	32
Third party sites requiring expenditure on remediation	16
Number of sites for which environmental remediation expense is not required	78
Possible increase in legal and administrative proceedings | $	$ 100,000
Number of sites which potential liability could exceed $100,000	10
Notices received from owners of third party sites seeking indemnification from the company	6
Wichita Property
Superfund Proceedings
State-designated superfund site acquired, total acres | a		1,400
Certain other third party sites
Superfund Proceedings
Indemnification agreement with third party sites, sites	11
Safety-Kleen
Superfund Proceedings
Notices received from owners of third party sites seeking indemnification from the company	17