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Business Segment Information (Reconciliation of Total Operating Profit Reported for Business Segments to Income from Operations in Consolidated Statements of Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting [Abstract]      
Total operating profit from segments above $ 645,235 $ 519,885 $ 532,620
Corporate overhead expenses (91,854) (73,998) (72,196)
Income from operations $ 553,381 $ 445,887 $ 460,424