ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Reclassification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	$ 55,562	$ 49,955	$ 110,554	$ 99,037
Selling, general and administrative expenses	7,301	7,198	15,549	14,448
Reclassification to operations	711	(227)	2,026	174
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	669	(227)	1,892	174
Selling, general and administrative expenses	$ 42	$ 0	$ 134	$ 0