Income Tax (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Abstract]
Operating expenses not currently deductible	$ 4,597	$ 2,642
Employee benefit plans	5,156	4,020
Capital loss carryforward	203	160
Property and equipment	397	195
Total deferred income tax assets	10,353	7,017
Intangible assets	(10,043)	(9,673)
Other	(156)	(149)
Total deferred income tax liabilities	(10,199)	(9,822)
Net deferred income tax assets (liabilities)	$ 154	$ (2,805)