FAIR VALUE (NARRATIVE) (DETAILS) - USD ($) $ in Thousands			3 Months Ended							12 Months Ended
	Aug. 08, 2014	Feb. 28, 2014	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015
Business acquisitions, Contingent Consideration [Line Items]
Average interest rate on annual borrowings										1.50%	1.20%
Iknowtion [Member]
Business acquisitions, Contingent Consideration [Line Items]
Discount rate										21.00%
Guidon [Member]
Business acquisitions, Contingent Consideration [Line Items]
Discount rate										21.00%
Technology Solutions Group
Business acquisitions, Contingent Consideration [Line Items]
Discount rate										4.60%
Increase (decrease) in contingent consideration payable							$ 3,900		$ 4,000
WebMetro
Business acquisitions, Contingent Consideration [Line Items]
Discount rate										5.30%
Increase (decrease) in contingent consideration payable								$ 1,700
Sofica [Member]
Business acquisitions, Contingent Consideration [Line Items]
Future Value of Liabilities Incurred From Business Acquisitions		$ 3,800
Valuation Technique on Contingent Consideration		The fair value of the contingent consideration was measured based on significant inputs not observable in the market (Level 3 inputs). Key assumptions include a discount rate of 5.0% and expected future value of payments of $4.0 million. The $4.0 million of expected future payments was calculated using a probability weighted EBITDA assessment with the highest probability associated with Sofica achieving the targeted EBITDA for each earn-out year.
Discount rate		5.00%
Increase (decrease) in contingent consideration payable						$ 500	600	$ 1,800
rogenSi [Member]
Business acquisitions, Contingent Consideration [Line Items]
Future Value of Liabilities Incurred From Business Acquisitions	$ 15,300
Valuation Technique on Contingent Consideration	The fair value of the contingent consideration was measured by applying a probability weighted discounted cash flow model based on significant inputs not observable in the market (Level 3 inputs). Key assumptions include a discount rate of 4.6% and expected future value of payments of $15.3 million. The $15.3 million of expected future payments was calculated using a probability weighted EBITDA assessment with the highest probability associated with rogenSi achieving the targeted EBITDA for each earn-out year.
Discount rate	4.60%
Increase (decrease) in contingent consideration payable			$ (4,300)	$ (300)	$ 800		$ 500
Atelka [Member]
Business acquisitions, Contingent Consideration [Line Items]
Discount rate										0.00%