Summary Of Significant Accounting Policies (Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Allowance as of the beginning of the year	$ 44,155	$ 43,958	$ 44,883
Additions expensed during the year	5,099	4,213	5,232
Net deductions	(4,945)	(4,016)	(6,157)
Allowance as of the end of the year	$ 44,309	$ 44,155	$ 43,958