Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2021	$ 1,798,408
Additions	1,657,364
Balance at September 30, 2021	$ 3,455,772

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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