Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,931	$ 8,888
Accumulated Amortization	(8,162)	(7,447)
Net Carrying Amount	769	1,441
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,278	1,278
Accumulated Amortization	(929)	(831)
Net Carrying Amount	349	447
Contracts - Third Party [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,650	3,650
Accumulated Amortization	(3,650)	(3,259)
Net Carrying Amount		391
Contracts Owned Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,003	3,960
Accumulated Amortization	(3,583)	(3,357)
Net Carrying Amount	$ 420	$ 603