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Business Acquisitions and Investments, CompressorWorks Asset Acquisition (Details) (USD $)
1 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Apr. 30, 2012
Apr. 30, 2012
Customer Relationships [Member]
Apr. 30, 2012
Trademarks And Trade Names [Member]
Apr. 30, 2012
Non-compete Agreements [Member]
Apr. 30, 2012
Leasehold [Member]
Sep. 30, 2013
CompressorWorks, Inc. [Member]
Apr. 30, 2012
CompressorWorks, Inc. [Member]
Business Acquisition [Line Items]                  
Estimated useful life of intangible assets       7 years 3 years 3 years 2 years 3 months 18 days    
Purchase price excluding working capital adjustment     $ 37,400,000            
Working capital adjustment     1,200,000            
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                  
Purchase price               38,594,000  
Assets acquired and liabilities assumed [Abstract]                  
Receivables                 9,114,000
Inventory                 22,736,000
Other current assets                 60,000
Property, plant and equipment                 1,427,000
Intangible assets     8,900,000 8,000,000 500,000 200,000 200,000   8,870,000
Goodwill 37,959,000 35,827,000             9,703,000
Current liabilities                 (13,316,000)
Net assets acquired                 $ 38,594,000