Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,314	$ 5,315
Accumulated Amortization	(4,737)	(4,638)
Net Carrying Amount	577	677
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,278	1,278
Accumulated Amortization	(995)	(962)
Net Carrying Amount	283	316
Contracts Owned Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,036	4,037
Accumulated Amortization	(3,742)	(3,676)
Net Carrying Amount	$ 294	$ 361

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant