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Acquisitions - Unaudited Proforma Information (Details) - Boat Holdings, LLC - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Net sales $ 1,651,415 $ 1,593,659 $ 4,802,580 $ 4,410,691
Net income $ 99,224 $ 81,473 $ 268,660 $ 149,517
Basic earnings per share (in dollars per share) $ 1.60 $ 1.30 $ 4.27 $ 2.38
Diluted earnings per common share (in dollars per share) $ 1.56 $ 1.28 $ 4.16 $ 2.34