ACQUISITION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	May. 13, 2015	Dec. 31, 2014
Acquisition [Line Items]
Intangible assets					$ 12,900
Net liabilities					500
Goodwill	$ 155,515		$ 155,515		2,600	$ 156,178
Goodwill, Purchase Accounting Adjustments	1,600
Acquisition Date			May 13, 2015
Total purchase price			$ 15,000
Cash paid			14,000
Holdback amount			1,000
Transaction costs	100		400
Revenues	86,530	$ 87,202	264,599	$ 255,656
Net income (loss)	$ (5,359)	$ 1,820	$ 5,313	$ (10,755)
Basic earnings per share (in usd per share)	$ (0.07)	$ (0.02)	$ 0.07	$ (0.15)
Diluted earnings per share (in usd per share)	$ (0.07)	$ (0.02)	$ 0.07	$ (0.15)
Customer Relationships [Member]
Acquisition [Line Items]
Intangible assets					900
Useful life			10 years
In Process Research and Development [Member]
Acquisition [Line Items]
Intangible assets					$ 12,000
Useful life			15 years