GEOGRAPHIC INFORMATION (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue and long-lived assets by geographical segments
Revenues	$ 84,594	$ 55,626	$ 215,956	$ 166,147
North America
Revenue and long-lived assets by geographical segments
Revenues	70,205	54,668	198,770	163,290
Europe, Middle East and Africa (excluding U.K.)
Revenue and long-lived assets by geographical segments
Revenues	6,156		6,156
United Kingdom
Revenue and long-lived assets by geographical segments
Revenues	3,450	958	6,247	2,857
Asia Pacific (APAC)
Revenue and long-lived assets by geographical segments
Revenues	3,454		3,454
Latin America
Revenue and long-lived assets by geographical segments
Revenues	$ 1,329		$ 1,329