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Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total, Before Tax | $ 556,201 | $ 542,400 | $ (329,378)
Total, Tax Effect | (49,455) | (51,691) | 28,913
Total, Net of Tax | 506,746 | 490,709 | (300,465)
URA(D) On Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | 462,939 | 547,539 | (275,511)
Tax Effect | (39,729) | (49,665) | (21,061)
Net of Tax | 423,210 | 497,874 | (254,450)
Reclassification, Before Tax | 2,253 | (13,129) | 28,014
Reclassification, Tax Effect | (5,729) | 516 | (518)
Reclassification, Net of Tax | (3,476) | (12,613) | 27,496
Total, Net of Tax | 419,734 | 485,261 |
URA(D) On Securities OTTI [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax |  | (1,559) | (1,071)
Tax Effect |  | 115 | (135)
Net of Tax |  | (1,444) | (1,206)
Total, Net of Tax |  | (1,444) |
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | 90,142 | 18,585 | (86,520)
Tax Effect | (3,815) | (4,555) | 9,704
Net of Tax | 86,327 | 14,030 | (76,816)
Total, Net of Tax | 86,327 | 14,030 |
Benefit Plan Net Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | (7,107) | (15,938) | (646)
Tax Effect | 1,492 | 3,347 | 136
Net of Tax | (5,615) | (12,591) | (510)
Reclassification, Before Tax | 7,974 | 6,902 | 6,356
Reclassification, Tax Effect | (1,674) | (1,449) | (1,335)
Reclassification, Net of Tax | 6,300 | 5,453 | $ 5,021
Total, Net of Tax | $ 685 | $ (7,138) |

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