OPERATING SEGMENTS, Revenues by Service Offering (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]
Revenues	$ 160,384	$ 124,198
Software development [Member]
Revenue from External Customer [Line Items]
Revenues	110,687	83,780
Application testing services [Member]
Revenue from External Customer [Line Items]
Revenues	31,770	24,153
Application maintenance and support [Member]
Revenue from External Customer [Line Items]
Revenues	11,378	10,839
Infrastructure services [Member]
Revenue from External Customer [Line Items]
Revenues	3,754	3,410
Licensing [Member]
Revenue from External Customer [Line Items]
Revenues	828	578
Reimbursable expenses and other revenues [Member]
Revenue from External Customer [Line Items]
Revenues	$ 1,967	$ 1,438