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Basis Of Presentation (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Basis Of Accounting [Line Items] |  |  |  |  |  |
Total shareholders' equity | $ 10,416,789 |  | $ 9,726,176 | $ 9,286,299 |  |
Retained Earnings [Member] |  |  |  |  |  |
Basis Of Accounting [Line Items] |  |  |  |  |  |
Total shareholders' equity | $ 11,465,022 | $ 10,847,086 | 10,567,452 | $ 10,384,645 | $ 10,255,692 | $ 10,306,571
Retained Earnings [Member] | Cumulative Effect Period Of Adoption Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Basis Of Accounting [Line Items] |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  | $ (4,214)

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