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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total, Before Tax | $ 137,735 | $ 639,188 | $ (201,375) | $ 304,606
Total, Tax Effect | (15,636) | (72,300) | 23,654 | (35,622)
Total, Net of Tax | 122,099 | 566,888 | (177,721) | 268,984
URA(D) On Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax | 94,009 | 620,926 | (235,157) | 305,725
Tax Effect | (9,838) | (69,173) | 30,713 | (33,371)
Net of Tax | 84,171 | 551,753 | (204,444) | 272,354
Reclassification, Before Tax | 3,118 | (6,849) | (424) | 31,328
Reclassification, Tax Effect | (1,528) | (408) | (1,652) | (7,186)
Reclassification, Net of Tax | 1,590 | (7,257) | (2,076) | 24,142
Total, Net of Tax | 85,761 | 544,496 | (206,520) | 296,496
Foreign Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax | 38,022 | 22,825 | 29,034 | (35,898)
Tax Effect | (3,727) | (2,239) | (4,321) | 5,660
Net of Tax | 34,295 | 20,586 | 24,713 | (30,238)
Total, Net of Tax | 34,295 | 20,586 | 24,713 | (30,238)
Benefit Plan Net Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification, Before Tax | 2,586 | 2,286 | 5,172 | 3,451
Reclassification, Tax Effect | (543) | (480) | (1,086) | (725)
Reclassification, Net of Tax | 2,043 | 1,806 | 4,086 | 2,726
Total, Net of Tax | $ 2,043 | $ 1,806 | $ 4,086 | $ 2,726

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