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Acquisitions and Investments (Schedule of Unaudited Pro Forma Information) (Details) (Specialized Industries LP, USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Specialized Industries LP
       
Business Acquisition [Line Items]        
Net Sales $ 218,051 $ 214,857 $ 425,482 $ 405,109
Net Income $ 8,782 $ 13,035 $ 17,857 $ 19,201
Diluted Earnings per Share $ 0.72 $ 1.07 $ 1.45 $ 1.58