Income Taxes (Schedule Of Uncertain Tax Position Liability And Liability For Interest And Penalties On Uncertain Tax Positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Beginning balance	$ 1,437	$ 2,100	$ 2,004
Increases related to current year tax positions	103	92	281
Increases related to prior year tax positions	403
Decreases related to prior year tax positions	(70)	(265)	(185)
Decreases due to the lapsing of statutes of limitations	(904)	(490)
Ending balance	969	1,437	2,100
Beginning Balance	366	422	489
Accrual of interest and penalties	50	91	66
Decreases related to prior year tax positions	(206)	(147)	(133)
Ending Balance	$ 210	$ 366	$ 422