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Acquisitions (Pro Forma Information) (Details) - Renewable Energy & Conservation - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]    
Net sales $ 304,994 $ 845,538
Net income $ 15,391 $ 33,617
Net income per share - Basic (in dollars per share) $ 0.49 $ 1.08
Net income per share -Diluted (in dollars per share) $ 0.49 $ 1.07