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Business Acquisitions and Investments, Compressor Works Asset Acquisition (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets acquired and liabilities assumed [Abstract]                      
Goodwill $ 38,005,000       $ 35,827,000       $ 38,005,000 $ 35,827,000 $ 26,124,000
Revenues 218,708,000 264,162,000 270,126,000 230,708,000 192,355,000 275,975,000 268,875,000 211,711,000 983,704,000 948,916,000 874,625,000
Unaudited pro forma financial information [Abstract]                      
Revenues 218,708,000 264,162,000 270,126,000 230,708,000 192,355,000 275,975,000 268,875,000 211,711,000 983,704,000 948,916,000 874,625,000
Net earnings 8,936,000 17,297,000 16,043,000 9,174,000 5,915,000 16,840,000 13,404,000 5,194,000 51,450,000 41,353,000 62,401,000
Pro Forma Revenues                 984,019,000 970,279,000  
Pro Forma Net earnings                 51,598,000 43,282,000  
CompressorWorks, Inc. [Member]
                      
Business Acquisition [Line Items]                      
Purchase price excluding working capital adjustment         37,400,000         37,400,000  
Working capital adjustment         1,200,000         1,200,000  
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                      
Purchase price:                 38,594,000 38,600  
Assets acquired and liabilities assumed [Abstract]                      
Receivables 9,114,000               9,114,000    
Inventory 22,736,000               22,736,000    
Other current assets 60,000               60,000    
Property, plant and equipment, net 1,427,000               1,427,000    
Intangible assets 8,870,000               8,870,000    
Goodwill 9,703,000               9,703,000    
Current liabilities (13,316,000)               (13,316,000)    
Net assets acquired 38,594,000               38,594,000    
Intangible assets 8,870,000               8,870,000    
Revenues                   44,300,000  
Unaudited pro forma financial information [Abstract]                      
Revenues                   44,300,000  
CompressorWorks, Inc. [Member] | Customer Relationships [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets         8,000,000         8,000,000  
Intangible assets         8,000,000         8,000,000  
Estimated useful life of intangible assets                   7 years  
CompressorWorks, Inc. [Member] | Trademarks And Trade Names [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets         500,000         500,000  
Intangible assets         500,000         500,000  
Estimated useful life of intangible assets                   3 years  
CompressorWorks, Inc. [Member] | Non-compete Agreements [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets         200,000         200,000  
Intangible assets         200,000         200,000  
Estimated useful life of intangible assets                   3 years  
CompressorWorks, Inc. [Member] | Leasehold [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets         200,000         200,000  
Intangible assets         $ 200,000         $ 200,000  
Estimated useful life of intangible assets                   2 years 3 months 18 days