BUSINESS COMBINATIONS (2015 Acquisitions Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 11, 2015	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill, acquired during period		$ 46,539	$ 7,401
Thermo Fluids Inc.
Business Acquisition [Line Items]
Purchase price	$ 78,600
Revenue of acquiree since acquisition date		33,800
Acquisition related costs		600
Privately Owned Domestic Company
Business Acquisition [Line Items]
Payments to acquire businesses, gross		14,700	$ 16,100
Goodwill, acquired during period		$ 7,400