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Business Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
Noncompete agreement
Sep. 30, 2013
Mile Rail
Aug. 05, 2013
Mile Rail
Sep. 30, 2013
Mile Rail
Customer Relationships [Member]
Aug. 05, 2013
Mile Rail
Customer Relationships [Member]
Sep. 30, 2013
Mile Rail
Noncompete agreement
Aug. 05, 2013
Mile Rail
Noncompete agreement
Business Acquisition [Line Items]                    
Inventory         $ 512          
Other assets         14          
Intangible assets         650          
Goodwill 58,554 51,418 19,226   4,167          
Property, plant and equipment         2,605          
Other liabilities         144          
Total Purchase Price         7,804          
Customer relationship               400    
Noncompete agreements                   250
Total identifiable intangible assets           $ 650        
Useful Life       2 years     5 years   5 years  
Weighted average useful life         5 years [1]          
[1] weighted average number of years