Intangible Assets (Schedule Of Amortization Expense For Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 43	$ 44	$ 86	$ 89
Patents
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	26	27	52	56
Software
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	8	8	15	15
Marketing assets and customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	3	2	6	5
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 6	$ 7	$ 13	$ 13