Income Taxes (Schedule Of Roll Forward Of Valuation Allowance For Deferred Income Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Valuation Allowance, Balance at beginning of period	$ 17,120	$ 17,610	$ 18,504
Charged (Credited) to Costs and Expenses	156		(1,300)
Other Adjustments	(1,195)	(490)	406
Valuation Allowance, Balance at end of period	$ 16,081	$ 17,120	$ 17,610