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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total, Before Tax | $ 199,401 | $ (107,370) | $ 471,106 | $ (307,401)
Total, Tax Effect | (28,192) | 4,006 | (53,451) | 24,155
Total, Net of Tax | 171,209 | (103,364) | 417,655 | (283,246)
URA(D) On Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax | 228,053 | (41,271) | 484,683 | (250,431)
Tax Effect | (28,872) | (906) | (52,263) | 17,840
Net of Tax | 199,181 | (42,177) | 432,420 | (232,591)
Reclassification, Before Tax | (787) | 350 |  | (9,975)
Reclassification, Tax Effect | 1,082 | (101) |  | 1,452
Reclassification, Net of Tax | (1,869) | 249 |  | (8,523)
Total, Net of Tax | 197,312 | (41,928) | 428,729 | (241,114)
URA(D) On Securities OTTI [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax | (1,499) | 456 | (1,743) | 267
Tax Effect | 77 | (55) | 147 | (76)
Net of Tax | (1,422) | 401 | (1,596) | 191
Reclassification, Before Tax |  |  | (3,523) |
Reclassification, Tax Effect |  |  | (168) |
Reclassification, Net of Tax |  |  | (3,691) |
Total, Net of Tax | (1,422) | 401 | (1,596) | 191
Foreign Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax | (27,823) | (69,202) | (11,225) | (51,857)
Tax Effect | 1,991 | 5,550 | (555) | 5,904
Net of Tax | (25,832) | (63,652) | (11,780) | (45,953)
Total, Net of Tax | (25,832) | (63,652) | (11,780) | (45,953)
Benefit Plan Net Actuarial Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax | 0 |  | 0 |
Tax Effect | 0 |  | 0 |
Net of Tax | 0 |  | 0 |
Reclassification, Before Tax | 1,457 | 2,297 | 2,914 | 4,595
Reclassification, Tax Effect | (306) | (482) | (612) | (965)
Reclassification, Net of Tax | 1,151 | 1,815 | 2,302 | 3,630
Total, Net of Tax | $ 1,151 | $ 1,815 | $ 2,302 | $ 3,630

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