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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Total operating profit from segments $ 154,353 $ 128,211
Income from operations 132,837 110,228
Operating Segments    
Segment Reporting Information [Line Items]    
Total operating profit from segments 154,353 128,211
Corporate    
Segment Reporting Information [Line Items]    
Corporate overhead expenses $ (21,516) $ (17,983)