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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