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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting [Abstract]      
Total operating profit from segments above $ 519,885 $ 532,620 $ 507,634
Corporate overhead expenses (73,998) (72,196) (65,646)
Income from operations $ 445,887 $ 460,424 $ 441,988