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Recent Accounting Pronouncements (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Buildings and leasehold improvements [Member] Minimum [Member] | Dec. 31, 2012 Buildings and leasehold improvements [Member] Maximum [Member] | Dec. 31, 2012 Machinery, equipment and rental tools [Member] Minimum [Member] | Dec. 31, 2012 Machinery, equipment and rental tools [Member] Maximum [Member] | Dec. 31, 2012 Furniture and fixtures [Member] | Dec. 31, 2012 Transportation equipment [Member] | Dec. 31, 2011 Transportation equipment [Member] | Dec. 31, 2012 Transportation equipment [Member] Minimum [Member] | Dec. 31, 2012 Transportation equipment [Member] Maximum [Member] | Dec. 31, 2012 Computer Equipment and Software [Member] Minimum [Member] | Dec. 31, 2012 Computer Equipment and Software [Member] Maximum [Member] | Dec. 31, 2012 Computer software [Member] | Dec. 31, 2012 Computer software [Member] Minimum [Member] | Dec. 31, 2012 Computer software [Member] Maximum [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  | 2 years | 30 years | 7 years | 10 years | 3 years |  |  | 2 years | 5 years | 3 years | 7 years |  | 3 years | 7 years
Property and equipment, unamortized | $ 96,860 | $ 76,074 |  |  |  |  |  | $ 5,136 | $ 4,853 |  |  |  |  | $ 4,600 |  |

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- Definition Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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