SEGMENT REPORTING (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue and long-lived assets excluding intangible assets, by geographical area
Revenue	$ 482,083	$ 373,085	$ 283,326
Long-lived assets	88,319	63,457
United States
Revenue and long-lived assets excluding intangible assets, by geographical area
Revenue	431,615	346,454	261,864
Long-lived assets	84,384	61,550
Other countries
Revenue and long-lived assets excluding intangible assets, by geographical area
Revenue	50,468	26,631	21,462
Long-lived assets	$ 3,935	$ 1,907