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Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 139,469	$ 140,583	$ 417,358	$ 519,065
Corporate overhead expenses	(30,997)	(89,537)
Income from operations	108,472	51,046	322,840	381,705
Compensation, benefits and other personnel	$ 180,470	227,127	529,591	545,532
Operating Segments
Segment Reporting Information [Line Items]
Total operating profit from segments			417,358	519,065
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate overhead expenses			$ (94,518)	(137,360)
Voluntary Seperation Program | Employee Stock Option
Segment Reporting Information [Line Items]
Compensation, benefits and other personnel		$ 56,996		$ 56,996

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