Segments and Operations by Geographic Area Segments and Operations by Geographic Area (Schedule of Significant Customers, Revenue Concentration) (Details) (Segment, Continuing Operations [Member], Reportable Segment [Member], Customer Concentration Risk [Member], Communications [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Direct Tv [Member]
Segment Reporting Information [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	17.00%	20.00%	20.00%
At T [Member]
Segment Reporting Information [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	18.00%	24.00%	22.00%