ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Reclassification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	$ 52,393	$ 51,928	$ 162,946	$ 150,965
Selling, general and administrative expenses	7,503	7,153	23,052	21,601
Reclassification to operations	341	(1,168)	2,367	(994)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Foreign exchange contracts | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	324	(1,099)	2,215	(925)
Selling, general and administrative expenses	$ 17	$ (69)	$ 152	$ (69)