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Acquisitions - Condensed Pro Forma Consolidated Results of Operations (Details) - ATCO [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Net sales | $ $ 1,390,409
Net income | $ $ 62,405
Basic earnings per share (in dollars per share) | $ / shares $ 1.10
Diluted earnings per share (in dollars per share) | $ / shares $ 1.09