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Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total, Before Tax | $ (339,110) | $ (334,581)
Total, Tax Effect | 39,290 | 36,678
Total, Net of Tax | (299,820) | (297,903)
URA(D) On Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Before Tax | (329,166) | (315,200)
Tax Effect | 40,551 | 35,802
Net of Tax | (288,615) | (279,398)
Reclassification, Before Tax | (3,542) | 38,177
Reclassification, Tax Effect | (124) | (6,778)
Reclassification, Net of Tax | (3,666) | 31,399
URA(D) On Securities OTTI [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total, Net of Tax | (292,281) | (247,999)
Foreign Currency Translation Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Before Tax | (8,988) | (58,723)
Tax Effect | (594) | 7,899
Net of Tax | (9,582) | (50,824)
Total, Net of Tax | (9,582) | (50,824)
Benefit Plan Net Gain (Loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification, Before Tax | 2,586 | 1,165
Reclassification, Tax Effect | (543) | (245)
Reclassification, Net of Tax | 2,043 | 920
Total, Net of Tax | $ 2,043 | $ 920

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