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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total, Before Tax | $ 542,400 | $ (329,378) | $ 56,989
Total, Tax Effect | (51,691) | 28,913 | 134
Total, Net of Tax | 490,709 | (300,465) | 57,123
URA(D) On Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | 547,539 | (275,511) | (81,915)
Tax Effect | (49,665) | 21,061 | (21,597)
Net of Tax | 497,874 | (254,450) | (60,318)
Reclassification, Before Tax | (13,129) | 28,014 | (7,258)
Reclassification, Tax Effect | 516 | (518) | 308
Reclassification, Net of Tax | (12,613) | 27,496 | (6,950)
Total, Net of Tax | 485,261 | (226,954) |
URA(D) On Securities OTTI [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | (1,559) | (1,071) | (5,618)
Tax Effect | 115 | (135) | 1,588
Net of Tax | (1,444) | (1,206) | (4,030)
Total, Net of Tax | (1,444) | (1,206) |
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | 18,585 | (86,520) | 142,054
Tax Effect | (4,555) | 9,704 | (20,137)
Net of Tax | 14,030 | (76,816) | 121,917
Total, Net of Tax | 14,030 | (76,816) |
Benefit Plan Net Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before Tax | (15,938) | (646) | 1,300
Tax Effect | 3,347 | 136 | (273)
Net of Tax | (12,591) | (510) | 1,027
Reclassification, Before Tax | 6,902 | 6,356 | 8,426
Reclassification, Tax Effect | (1,449) | (1,335) | (2,949)
Reclassification, Net of Tax | 5,453 | 5,021 | $ 5,477
Total, Net of Tax | $ (7,138) | $ 4,511 |

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