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Acquisitions (Pro Forma Information) (Details) - Renewable Energy & Conservation
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Net sales | $ $ 240,538
Net income | $ $ 7,582
Net income per share - Basic (in dollars per share) | $ / shares $ 0.24
Net income per share -Diluted (in dollars per share) | $ / shares $ 0.24