Business & Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2014 Line
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of satellite radio systems	2
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Length of prepaid subscriptions, term	3 months
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Length of prepaid subscriptions, term	12 months