Natrue Of Operations And Critical Accounting Policies And Estimates (Schedule Of Allowance For Uncollectible Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Nature Of Operations And Critical Accounting Policies And Estimates [Abstract]
Balance at the beginning of the year	$ 638	$ 759	$ 350
Additions (reduction) changes to expense	(125)	672	534
Recoveries of previous write offs	97	24	44
Current period write offs	(232)	(817)	(169)
Balance at the end of the year	$ 378	$ 638	$ 759