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Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | $ 9,726,176 | $ 9,132,925 |
Current period change | (523,375) | 506,746 | $ 490,709
Balance | 10,139,180 | 9,726,176 | 9,132,925
URA(D) On Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 724,159 | 304,425 |
Current period change | 484,762 | (419,734) |
Balance | 239,397 | 724,159 | 304,425
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (115,390) | (201,717) |
Current period change | (62,091) | 86,327 |
Balance | (177,481) | (115,390) | (201,717)
Benefit Plan Net Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (73,870) | (74,556) |
Current period change | 23,478 | 685 |
Balance | (50,392) | (73,870) | (74,556)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 534,899 | 28,152 | (462,557)
Current period change | (523,375) | 506,746 | 490,709
Balance | $ 11,523 | $ 534,899 | $ 28,152

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