PRINCIPAL CLIENTS (Tables)

3 Months Ended

Mar. 31, 2014

Risks and Uncertainties [Abstract]

Schedule of Revenue by Major Customers

The following table represents revenue concentration of our principal clients:

	Three Months Ended March 31,
	2014		2013
	Revenue	Percentage	Revenue	Percentage
AT&T Services, Inc. and AT&T Mobility, LLC, subsidiaries of AT&T, Inc. (1)	$15,344	24.3%	$13,303	24.7%
T-Mobile USA, Inc., a subsidiary of Deutsche Telekom (2)	$18,639	29.5%	$13,334	24.8%
Comcast Cable Communications Management, LLC, subsidiary of Comcast Corporation (2)	$10,959	17.3%	$11,357	21.1%

(1) Revenue from this customer is generated through our Domestic and Asia Pacific segments.

(2) Revenue from this customer is generated through our Domestic, Asia Pacific and Latin America segments.