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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Total operating profit from segments $ 158,343 $ 117,703 $ 312,696 $ 245,914
Income from operations 136,021 100,312 268,858 210,540
Operating Segments        
Segment Reporting Information [Line Items]        
Total operating profit from segments 158,343 117,703 312,696 245,914
Corporate        
Segment Reporting Information [Line Items]        
Corporate overhead expenses $ (22,322) $ (17,391) $ (43,838) $ (35,374)