DERIVATIVES (Details) - Foreign currency contracts - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Unrealized gain, net of less than $0.1 million and $0.1 million income tax, respectively, included in "Accumulated items of other comprehensive loss" in the accompanying consolidated balance sheets	$ 85	$ 638
Realized loss on effective portion, included as compensation expense in "Direct costs of customer support" and "Sales, general and administrative" in the accompanying consolidated statements of operations and comprehensive loss	$ (80)	$ (179)