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INVESTMENTS (Notes)
9 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Investments and Other Noncurrent Assets [Text Block]
INVESTMENTS
In the third quarter of 2017, pursuant to the achievement of certain performance milestones, the Company purchased additional preferred stock representing a 2.3% interest in the fully diluted shares of a leading tech skills assessment company for $0.5 million, bringing its total interest to 10.0%. The Company has recorded the investment using the cost method, which is included in the Other assets section of the Condensed Consolidated Balance Sheets.