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, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 4,814	$ 6,691	$ 7,317
Provision for Loan, Lease, and Other Losses	3,681	1,500	5,878
Financing Receivable, Allowance for Credit Losses, Write-downs	(3,576)	(3,377)	(6,504)
Balance at end of year	$ 4,919	$ 4,814	$ 6,691