GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2015
Indefinite-lived Intangible Assets [Line Items]
Goodwill		$ 453,105,000	$ 452,669,000	$ 570,960,000
Goodwill, Impaired, Accumulated Impairment Loss		155,400,000
Goodwill impairment charge		(31,992,000)	(123,414,000)	0
Property, plant and equipment, net		1,532,467,000	1,558,834,000
Intangible assets		506,818,000	530,080,000
Total permits and other intangible assets, amortization expense		40,200,000	36,700,000	35,100,000
Oil and Gas Field Services
Indefinite-lived Intangible Assets [Line Items]
Goodwill, Gross					$ 32,000,000
Goodwill, Fair Value Disclosure					$ 0
Goodwill		0	33,744,000	$ 36,506,000
Goodwill impairment charge		(31,992,000)	0
Property, plant and equipment, net		156,286,000	215,574,000
Intangible assets		14,862,000	$ 22,727,000
Kleen Performance Products
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 174,300,000
Goodwill impairment charge	$ 123,400,000
Customer and Supplier Relationships | Oil and Gas Field Services
Indefinite-lived Intangible Assets [Line Items]
Intangible assets		8,200,000
Other intangible assets | Oil and Gas Field Services
Indefinite-lived Intangible Assets [Line Items]
Intangible assets		$ 6,700,000