Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer			3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Concentration Risk [Line Items]
Number of customers			340
Credit Concentration Risk [Member] | Customer with Highest Net Accounts Receivable Position [Member] | Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	11.00%	18.00%
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		19.00%	12.00%
Customer Concentration Risk [Member] | Ten Largest Customers [Member] | Revenue [Member]
Concentration Risk [Line Items]
Number of customers			10	10
Concentration risk, percentage of total			58.00%	71.00%
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
Concentration risk, percentage of total			60.00%	73.00%