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Business Acquisitions (Pro Forma Financial Information) (Details) - LTG - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Business Acquisition [Line Items]    
Net sales $ 1,982,755 $ 6,284,588
Net income $ (5,869) $ 13,364