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Acquisitions Hopewell Acquisition (Details) (Hopewell [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jul. 19, 2013
Hopewell [Member]
         
Business Acquisition [Line Items]          
Property, plant, and equipment         $ 3,538
Intangible assets         984
Business Acquisition, Goodwill, Expected Tax Deductible Amount         1,200
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net         5,722
Revenue since Acquisition Date 400   1,200    
Net Income since Acquisition Date 400   900    
Net sales   243,295   684,334  
Net income   $ 9,459   $ 23,047