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CompressorWorks Acquisition (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
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 | 268,875,000 | 244,005,000 | 480,586,000 | 464,235,000 | 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 |  |
Revenues | 268,875,000 | 244,005,000 | 480,586,000 | 464,235,000 | 60,000,000
Net earnings | 13,404,000 | 13,338,000 | 18,598,000 | 20,045,000 |
Pro Forma Revenues | 275,613,000 | 274,278,000 | 500,328,000 | 515,924,000 |
Pro Forma Net earnings | 14,362,000 | 14,505,000 | 20,394,000 | 21,136,000 |
Customer Relationships [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Intangible assets | 8,000,000 |  | 8,000,000 |  |
Estimated useful life of intangible assets |  |  | 7 years |  |
Trademarks and Trade names [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Intangible assets | 500,000 |  | 500,000 |  |
Estimated useful life of intangible assets |  |  | 3 years |  |
Non-compete Agreements [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Intangible assets | 200,000 |  | 200,000 |  |
Estimated useful life of intangible assets |  |  | 3 years |  |
Leaseholds [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Intangible assets | 200,000 |  | 200,000 |  |
Estimated useful life of intangible assets |  |  | 2 years 3 months 18 days |  |
CompressorWorks, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues from the acquired business |  |  | 13,600,000 |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Revenues |  |  | $ 13,600,000 |  |
CompressorWorks, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Estimated useful life of intangible assets |  |  | 7 years |  |
CompressorWorks, Inc. [Member] | Non-compete Agreements [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Estimated useful life of intangible assets |  |  | 3 years |  |
CompressorWorks, Inc. [Member] | Leaseholds [Member] |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Estimated useful life of intangible assets |  |  | 2 years 3 months 18 days |  |

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