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Business Acquisitions and Investments, Compressor Works Asset Acquisition (Details) (USD $) | 3 Months Ended | 12 Months Ended
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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 |

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