SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Number of industry segments	1
Revenues from External Customers and Long-Lived Assets
Revenue	$ 326,919	$ 263,067	$ 214,653
Americas
Revenues from External Customers and Long-Lived Assets
Revenue	169,218	130,937	96,732
United States
Revenues from External Customers and Long-Lived Assets
Revenue	159,548	118,333	91,597
Other Americas
Revenues from External Customers and Long-Lived Assets
Revenue	9,670	12,604	5,135
EMEA
Revenues from External Customers and Long-Lived Assets
Revenue	84,066	72,013	49,291
United Kingdom
Revenues from External Customers and Long-Lived Assets
Revenue	24,715	28,129	20,862
Other EMEA
Revenues from External Customers and Long-Lived Assets
Revenue	59,351	43,884	28,429
JAPAN
Revenues from External Customers and Long-Lived Assets
Revenue	13,935	17,069	27,462
Other Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets
Revenue	59,700	43,048	41,168
APAC
Revenues from External Customers and Long-Lived Assets
Revenue	$ 73,635	$ 60,117	$ 68,630