GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill [Line Items]
Property, plant and equipment, net	$ 1,562,254		$ 1,562,254		$ 1,558,834
Goodwill impairment charge	31,992	$ 0	31,992	$ 0
Permits and other intangible, net	534,621		534,621		530,080
Oil and Gas Field Services
Goodwill [Line Items]
Goodwill	31,992		31,992
Property, plant and equipment, net	185,312		185,312		215,574
Goodwill impairment charge			0
Permits and other intangible, net	20,061		20,061		$ 22,727
Permits | Oil and Gas Field Services
Goodwill [Line Items]
Permits and other intangible, net	100		100
Customer and Supplier Relationships | Oil and Gas Field Services
Goodwill [Line Items]
Permits and other intangible, net	10,700		10,700
Other intangible assets | Oil and Gas Field Services
Goodwill [Line Items]
Permits and other intangible, net	$ 9,300		$ 9,300