Income Taxes (Schedule Of Uncertain Tax Position Liability And Liability For Interest And Penalties On Uncertain Tax Positions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Beginning balance	$ 1,788	$ 1,822	$ 1,742
Decreases related to prior year tax positions	(15)	(112)	(19)
Increases related to current year tax positions	231	78	99
Ending balance	2,004	1,788	1,822
Beginning Balance	418	391	342
Accrual of interest and penalties	79	65	49
Decreases related to prior year tax positions	(8)	(38)
Ending Balance	$ 489	$ 418	$ 391