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Business Acquisitions (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 192,355,000 |  | $ 275,975,000 | $ 268,875,000 | $ 211,711,000 | $ 174,170,000 |  | $ 236,220,000 |  | $ 244,005,000 |  | $ 220,230,000 |  | $ 948,916,000 |  | $ 874,625,000 | $ 810,910,000
Unaudited pro forma financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 192,355,000 |  | 275,975,000 | 268,875,000 | 211,711,000 | 174,170,000 |  | 236,220,000 |  | 244,005,000 |  | 220,230,000 |  | 948,916,000 |  | 874,625,000 | 810,910,000
Net earnings | 5,915,000 |  | 16,840,000 | 13,404,000 | 5,194,000 | 29,311,000 | [1] | 13,045,000 | [1] | 13,338,000 | [1] | 6,707,000 | [1] | 41,353,000 |  | 62,401,000 | 21,960,000
Pro Forma Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 968,658,000 |  | 963,751,000 |
Pro Forma Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,262,000 |  | 64,331,000 |
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 |  |  |
Revenues from the acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: | 38,594,000 |  |  |  |  |  |  |  |  |  |  |  |  | 38,594,000 |  |  |
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 |  |  |
BLD Products, Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of volume was sold to us (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |
Revenues from the acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: | 26,984,000 |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  | 26,984,000 |  | 27,000,000 |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables | 1,944,000 |  |  |  |  |  |  |  |  |  |  |  |  | 1,944,000 |  |  |
Inventory | 3,826,000 |  |  |  |  |  |  |  |  |  |  |  |  | 3,826,000 |  |  |
Other current assets | 3,000 | [2] |  |  |  |  |  |  |  |  |  |  |  | 3,000 | [2] |  |
Property, plant and equipment, net | 1,965,000 |  |  |  |  |  |  |  |  |  |  |  |  | 1,965,000 |  |  |
Other assets | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Intangible assets | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |
Goodwill | 12,867,000 |  |  |  |  |  |  |  |  |  |  |  |  | 12,867,000 |  |  |
Current liabilities | (821,000) |  |  |  |  |  |  |  |  |  |  |  |  | (821,000) |  |  |
Net assets acquired | 26,984,000 |  |  |  |  |  |  |  |  |  |  |  |  | 26,984,000 |  |  |
Intangible assets | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,500,000 |  |  |
Unaudited pro forma financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,500,000 |  |  |
BLD Products, Ltd [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |
Intangible assets | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  | 10 years |
Novo Products Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of entity (in hundredths) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Forecast Trading Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from the acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  |  |
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: | 44,250,000 |  |  |  |  | 44,300,000 |  |  |  |  |  |  |  | 44,250,000 |  | 44,300,000 |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 |  |  |
Inventory | 10,120,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,120,000 |  |  |
Other current assets | 700,000 | [2] |  |  |  |  |  |  |  |  |  |  |  | 700,000 | [2] |  |
Property, plant and equipment, net | 3,840,000 |  |  |  |  |  |  |  |  |  |  |  |  | 3,840,000 |  |  |
Other assets | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |
Intangible assets | 15,300,000 |  |  |  |  |  |  |  |  |  |  |  |  | 15,300,000 |  |  |
Goodwill | 11,820,000 |  |  |  |  |  |  |  |  |  |  |  |  | 11,820,000 |  |  |
Current liabilities | (3,840,000) |  |  |  |  |  |  |  |  |  |  |  |  | (3,840,000) |  |  |
Net assets acquired | 44,250,000 |  |  |  |  |  |  |  |  |  |  |  |  | 44,250,000 |  |  |
Intangible assets | 15,300,000 |  |  |  |  |  |  |  |  |  |  |  |  | 15,300,000 |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,800,000 |  |  |
Unaudited pro forma financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,800,000 |  |  |
Forecast Trading Corporation [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 13,800,000 |  |  |
Intangible assets | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 13,800,000 |  |  |
Forecast Trading Corporation [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  | 7 years |
Forecast Trading Corporation [Member] | Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  | 10 years |
Forecast Trading Corporation [Member] | Trademarks And Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Intangible assets | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Forecast Trading Corporation [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |
Intangible assets | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 5 years |
[1] | In December 2011, we realized a non-recurring non-cash benefit of $21.5 million in our tax provision related to a reduction of a significant portion of our deferred tax valuation allowance on net U.S. deferred tax assets.
[2] | The other current assets balance for Forecast Trading Corporation includes $0.7 million of cash acquired.

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