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Acquired Intangible Assets (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Total acquired intangible assets | $ 48,693,000 |  |  | $ 48,693,000 |  |  | $ 39,823,000 |
Less accumulated amortization | (11,597,000) | [1] |  | (11,597,000) | [1] |  | (9,467,000) | [1]
Net acquired intangible assets | 37,096,000 |  |  | 37,096,000 |  |  | 30,356,000 |
Amortization of acquired intangible assets [Abstract] |  |  |  |  |  |  |  |
Amortization expense | 1,200,000 |  | 400,000 | 2,100,000 |  | 800,000 |  |
Estimated amortization expense, remainder of current year | 2,600,000 |  |  | 2,600,000 |  |  |  |
Estimated amortization expense in year 2013 | 4,700,000 |  |  | 4,700,000 |  |  |  |
Estimated amortization expense in year 2014 | 4,100,000 |  |  | 4,100,000 |  |  |  |
Estimated amortization expense in years 2015 through 2028 | 20,500,000 |  |  | 20,500,000 |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Total acquired intangible assets | 40,100,000 |  |  | 40,100,000 |  |  | 32,100,000 |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  | 7 years |  |  |  |
Customer Relationships [Member] | CompressorWorks, Inc. [Member] |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Amount of acquired intangible assets | 8,000,000 |  |  | 8,000,000 |  |  |  |
Estimated useful life of intangible assets |  |  |  | 7 years |  |  |  |
Trademarks and Trade Names [Member] |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Total acquired intangible assets | 6,800,000 |  |  | 6,800,000 |  |  | 6,300,000 |
Trademarks and Trade Names [Member] | Dana Acquisition [Member] |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Amount of acquired indefinite-lived intangible assets | 5,200,000 |  |  | 5,200,000 |  |  |  |
Trademarks and Trade Names [Member] | CompressorWorks, Inc. [Member] |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Amount of acquired intangible assets | 500,000 |  |  | 500,000 |  |  |  |
Estimated useful life of intangible assets |  |  |  | 3 years |  |  |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Total acquired intangible assets | 910,000 |  |  | 910,000 |  |  | 700,000 |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  | 3 years |  |  |  |
Non-compete Agreements [Member] | CompressorWorks, Inc. [Member] |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Amount of acquired intangible assets | 200,000 |  |  | 200,000 |  |  |  |
Estimated useful life of intangible assets |  |  |  | 3 years |  |  |  |
Patents and Supply Contracts [Member] |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Total acquired intangible assets | 723,000 |  |  | 723,000 |  |  | 723,000 |
Leaseholds [Member] |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Total acquired intangible assets | 160,000 |  |  | 160,000 |  |  | 0 |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  | 2 years 3 months 18 days |  |  |  |
Leaseholds [Member] | CompressorWorks, Inc. [Member] |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Amount of acquired intangible assets | 200,000 |  |  | 200,000 |  |  |  |
Estimated useful life of intangible assets |  |  |  | 2 years 3 months 18 days |  |  |  |
CompressorWorks, Inc. [Member] |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Amount of acquired intangible assets | $ 8,900,000 |  |  | $ 8,900,000 |  |  |  |
[1] | Applies to all intangible assets, except for the Dana acquisition related trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

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- Definition Gross aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -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. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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