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Business Acquisitions and Investments, Pensacola Fuel Injection, Inc, and Annex Manufacturing Acquisitions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 54,881 |  |  |  | $ 54,975 |  |  |  | $ 54,881 | $ 54,975 | $ 38,005
Revenues | $ 204,967 | $ 270,037 | $ 269,382 | $ 227,589 | 218,054 | $ 257,046 | $ 272,540 | $ 232,752 | $ 971,975 | 980,392 | 983,704
Pensacola Fuel Injection Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  | 12,225 |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  | 0 |  |  |  |  | 0 |
Inventory |  |  |  |  | 2,815 |  |  |  |  | 2,815 |
Property, plant and equipment, net |  |  |  |  | 466 |  |  |  |  | 466 |
Intangible assets |  |  |  |  | 0 |  |  |  |  | 0 |
Goodwill |  |  |  |  | 12,528 |  |  |  |  | 12,528 |
Current liabilities |  |  |  |  | (3,584) |  |  |  |  | (3,584) |
Net assets acquired |  |  |  |  | 12,225 |  |  |  |  | 12,225 |
Annex Manufacturing [Member] |  |  |  |  |  |  |  |  |  |  |
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  | 11,500 |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  | 2,581 |  |  |  |  | 2,581 |
Inventory |  |  |  |  | 2,630 |  |  |  |  | 2,630 |
Property, plant and equipment, net |  |  |  |  | 128 |  |  |  |  | 128 |
Intangible assets |  |  |  |  | 4,760 |  |  |  |  | 4,760 |
Goodwill |  |  |  |  | 4,567 |  |  |  |  | 4,567 |
Current liabilities |  |  |  |  | (3,166) |  |  |  |  | (3,166) |
Net assets acquired |  |  |  |  | $ 11,500 |  |  |  |  | 11,500 |
Revenue reported by acquired entity for last annual period |  |  |  |  |  |  |  |  |  |  | $ 22,000
Percentage of volume from acquired business sold to parent |  |  |  |  |  |  |  |  |  |  | 40.00%
Revenues |  |  |  |  |  |  |  |  |  | 8,500 |
Annex Manufacturing [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  |  |  |  |  |  |  |  |  | $ 4,700 |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  | 7 years |
Annex Manufacturing [Member] | Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  |  |  |  |  |  |  |  |  | $ 100 |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  | 5 years |

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