Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,151	$ 5,090
Accumulated Amortization	(4,853)	(4,817)
Net Carrying Amount	1,298	273
Trademarks And Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,842	1,278
Accumulated Amortization	(1,164)	(1,084)
Net Carrying Amount	678	194
Contracts - Owned Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,689	3,812
Accumulated Amortization	(3,689)	(3,733)
Net Carrying Amount		$ 79
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	620
Net Carrying Amount	$ 620