PRINCIPAL CLIENTS Principal Clients (Tables)

3 Months Ended

Mar. 31, 2013

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,
	2013		2012
	Revenue	Percentage	Revenue	Percentage
AT&T Services, Inc. and AT&T Mobility, LLC, subsidiaries of AT&T, Inc. (1)	$13,303	24.7%	$19,415	38.2%
T-Mobile USA, Inc., a subsidiary of Deutsche Telekom (2)	$13,334	24.8%	$14,627	28.8%
Comcast Cable Communications Management, LLC, subsidiary of Comcast Corporation (2)	$11,357	21.1%		*

* less than 10%

(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.