ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of services	$ 270,779	$ 257,830	$ 219,608
Selling, general and administrative expenses	33,196	34,427	31,397
Reclassification to operations	431	2,587	3,186
Foreign Exchange Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of services	416	2,401	2,991
Selling, general and administrative expenses	$ 15	$ 186	$ 195