BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 248,792	$ 255,563
Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable, net	1,492
Materials and supplies	57
Equipment and property	840
Goodwill	196
Customer contracts	10,226
Other intangible assets	20,039
Current liabilities	(1,444)
Other assets and liabilities, net	80
Total consideration paid	$ 31,486
Less: Common Stock Payment
Less: Contingent consideration liability	$ (95)
Total cash purchase price	$ 31,391