Segments, Major Customers (Details)	3 Months Ended		9 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2013 Sales revenue, segment Customer concentration risk Customer	Sep. 30, 2012 Sales revenue, segment Customer concentration risk Customer	Sep. 30, 2013 Sales revenue, segment Customer concentration risk Customer	Sep. 30, 2013 United states Property, plant and equipment Geographic concentration risk	Dec. 31, 2012 United states Property, plant and equipment Geographic concentration risk	Sep. 30, 2012 Verizon Sales revenue, segment Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, number of major customers	0	0	0
Concentration risk, percentage				84.00%	83.00%	10.20%