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Acquisitions (Pro Forma Information) (Details) - Renewable Energy & Conservation - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]    
Net sales $ 300,005 $ 540,543
Net income $ 10,028 $ 18,059
Net income per share - Basic (in dollars per share) $ 0.32 $ 0.58
Net income per share -Diluted (in dollars per share) $ 0.32 $ 0.57