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Business Acquisitions Business Acquisitions (Mile Rail, LLC) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Aug. 05, 2013
Mile Rail
Aug. 05, 2013
Mile Rail
Customer Relationships
Aug. 05, 2013
Mile Rail
Noncompete agreement
Business Acquisition [Line Items]            
Inventory       $ 512    
Other assets       14    
Intangible assets       650   250
Goodwill 58,554 58,554 54,387 4,167    
Property, plant and equipment       2,605    
Other liabilities       (144)    
Total Purchase Price       7,804    
Customer relationship       $ 650 $ 400  
Useful Life         5 years 5 years
Weighted average useful life       5 years [1]    
[1] weighted average number of years