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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total, Before Tax $ (577,045) $ 556,201 $ 542,400
Total, Tax Effect 53,670 (49,455) (51,691)
Total, Net of Tax (523,375) 506,746 490,709
URA(D) On Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax (547,690) 462,939 547,539
Tax Effect 59,312 (39,729) (49,665)
Net of Tax (488,378) 423,210 497,874
Reclassification, Before Tax 5,347 2,253 (13,129)
Reclassification, Tax Effect (1,731) (5,729) 516
Reclassification, Net of Tax 3,616 (3,476) (12,613)
Total, Net of Tax 484,762 (419,734)  
URA(D) On Securities OTTI [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax (1,559)
Tax Effect 115
Net of Tax (1,444)
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax (64,421) 90,142 18,585
Tax Effect 2,330 (3,815) (4,555)
Net of Tax (62,091) 86,327 14,030
Total, Net of Tax (62,091) 86,327  
Benefit Plan Net Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax 7,912 (7,107) (15,938)
Tax Effect (1,661) 1,492 3,347
Net of Tax 6,251 (5,615) (12,591)
Reclassification, Before Tax 21,807 7,974 6,902
Reclassification, Tax Effect (4,580) (1,674) (1,449)
Reclassification, Net of Tax 17,227 6,300 $ 5,453
Total, Net of Tax $ 23,478 $ 685