Accounts Receivable (Schedule Of Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts, End of Period	$ 71,362	$ 93,267
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts, Beginning of Period	93,267	107,048	73,571
Charged to Other Revenue	68,965	74,332	93,721
Charged (credited) to Switched and Nonswitched Revenue and Other Accounts	(3,203)	14,396	16,403
Write-offs and Recoveries	(87,667)	(102,509)	(76,647)
Allowance for Doubtful Accounts, End of Period	$ 71,362	$ 93,267	$ 107,048