Nature Of Operations And Significant Accounting Policies (Summary Of Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 6,691	$ 7,317	$ 8,221
Provision for Loan, Lease, and Other Losses	1,500	5,878	5,518
Financing Receivable, Allowance for Credit Losses, Write-downs	(3,377)	(6,504)	(6,422)
Balance at end of year	$ 4,814	$ 6,691	$ 7,317