Nature Of Operations And Significant Accounting Policies (Schedule Of Allowance For Uncollectible Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Nature Of Operations And Significant Accounting Policies [Abstract]
Balance at the beginning of the year	$ 378	$ 638
Additions (reduction) changes to expense	80	(125)
Recoveries of previous write offs	12	97
Current period write offs	(68)	(232)
Balance at the end of the year	$ 402	$ 378