Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Estimated useful life [Abstract]
Amortization expense	$ 227	$ 225	$ 454	$ 452
Intangible assets, net [Abstract]
Gross Carrying Amount	8,860		8,860		8,888
Accumulated Amortization	(7,881)		(7,881)		(7,447)
Net Carrying Amount	979		979		1,441
Trademarks [Member]
Intangible assets, net [Abstract]
Gross Carrying Amount	1,278		1,278		1,278
Accumulated Amortization	(896)		(896)		(831)
Net Carrying Amount	382		382		447
Trademarks [Member] | Minimum [Member]
Estimated useful life [Abstract]
Estimated useful life of intangible assets			1 year
Trademarks [Member] | Maximum [Member]
Estimated useful life [Abstract]
Estimated useful life of intangible assets			10 years
Contracts - Third Party [Member]
Estimated useful life [Abstract]
Estimated useful life of intangible assets			7 years
Intangible assets, net [Abstract]
Gross Carrying Amount	3,650		3,650		3,650
Accumulated Amortization	(3,520)		(3,520)		(3,259)
Net Carrying Amount	130		130		391
Contracts Owned Equipment [Member]
Intangible assets, net [Abstract]
Gross Carrying Amount	3,932		3,932		3,960
Accumulated Amortization	(3,465)		(3,465)		(3,357)
Net Carrying Amount	$ 467		$ 467		$ 603
Contracts Owned Equipment [Member] | Minimum [Member]
Estimated useful life [Abstract]
Estimated useful life of intangible assets			5 years
Contracts Owned Equipment [Member] | Maximum [Member]
Estimated useful life [Abstract]
Estimated useful life of intangible assets			7 years