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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Total operating profit from segments $ 139,659 $ 158,343 $ 378,482 $ 312,696
Corporate overhead expenses (23,799) (22,322)    
Income from operations $ 115,860 $ 136,021 330,659 268,858
Operating Segments        
Segment Reporting Information [Line Items]        
Total operating profit from segments     378,482 312,696
Corporate        
Segment Reporting Information [Line Items]        
Corporate overhead expenses     $ (47,823) $ (43,838)