Business Segments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011 customers	Dec. 31, 2010 customers
Segment reporting, number of customers	3	3
Percentage of revenues	10.00%	10.00%
Atandt Mobility [Member]
Percentage of revenues	20.00%	20.00%
Sprint Nextel [Member]
Percentage of revenues	14.00%	16.00%
Verizon Wireless [Member]
Percentage of revenues	12.00%	15.00%