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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Total operating profit from segments $ 162,479 $ 129,377 $ 475,175 $ 375,291
Income from operations 141,125 111,337 409,983 321,877
Operating Segments        
Segment Reporting Information [Line Items]        
Total operating profit from segments 162,479 129,377 475,175 375,291
Corporate        
Segment Reporting Information [Line Items]        
Corporate overhead expenses $ (21,354) $ (18,040) $ (65,192) $ (53,414)