GEOGRAPHIC AND SEGMENT INFORMATION - NARRATIVE (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017 product_line segment	Jun. 30, 2016	Dec. 31, 2016 segment
Segment Reporting [Abstract]
Number of reportable segments (in segments)					1
Number of operating segments (in segments)			3
Number of product lines (in product lines) | product_line			4
Geographic concentration risk | Sales Revenue | International customers
Concentration Risk [Line Items]
Concentration receivable risk (as a percent)	11.10%	16.60%	13.70%	15.90%