Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer			3 Months Ended		9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Concentration Risk [Line Items]
Number of customers					480
Credit Concentration Risk [Member] | Customer with Highest Net Accounts Receivable Position Subsequent to AT&T's Acquisition of DIRECTV [Member] | Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	10.00%	19.00%
Customer Concentration Risk [Member] | Ten Largest Customers Subsequent to AT&T's Acquisition of DIRECTV [Member] | Revenue [Member]
Concentration Risk [Line Items]
Number of customers			10	10	10	10
Concentration risk, percentage of total			64.00%	65.00%	60.00%	68.00%