PRINCIPAL CLIENTS (Major Customer) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
AT&T Services, Inc. and AT&T Mobility, LLC, subsidiaries of AT&T Inc. [Member]
Revenue, Major Customers [Line Items]
Revenue	$ 63,904	[1]	$ 127,096	[1]
Revenue concentration, percentage	32.30%	[1]	57.90%	[1]
T-Mobile USA, Inc., a subsidiary of Deutsche Telekom [Member]
Revenue, Major Customers [Line Items]
Revenue	$ 55,916	[2]	$ 43,698	[2]
Revenue concentration, percentage	28.20%	[2]	19.90%	[2]

[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.