Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,104	$ 5,090
Accumulated Amortization	(4,881)	(4,817)
Net Carrying Amount	1,223	273
Trademarks And Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,840	1,278
Accumulated Amortization	(1,218)	(1,084)
Net Carrying Amount	622	194
Contracts - Owned Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,644	3,812
Accumulated Amortization	(3,644)	(3,733)
Net Carrying Amount		$ 79
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	620
Accumulated Amortization	(19)
Net Carrying Amount	$ 601