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Business Acquisitions and Investments, Pro Forma Information (Unaudited) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Unaudited pro forma financial information [Abstract]        
Net sales $ 264,162 $ 275,975 $ 764,996 $ 756,561
Net earnings 17,297 16,840 42,514 35,438
Pro Forma Net sales 264,162 276,254 765,310 777,508
Pro Forma Net earnings $ 17,297 $ 16,971 $ 42,662 $ 37,252