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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total, Before Tax $ (862,174) $ 137,735 $ (1,823,224) $ (201,375)
Total, Tax Effect 118,140 (15,636) 234,847 23,654
Total, Net of Tax (744,034) 122,099 (1,588,377) (177,721)
URA(D) On Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Before Tax (848,704) 94,009 (1,781,013) (235,157)
Tax Effect 116,340 (9,838) 233,473 30,713
Net of Tax (732,364) 84,171 (1,547,540) (204,444)
Reclassification, Before Tax 16,467 3,118 21,369 (424)
Reclassification, Tax Effect (626) (1,528) (1,350) (1,652)
Reclassification, Net of Tax 15,841 1,590 20,019 (2,076)
Total, Net of Tax (716,523) 85,761 (1,527,521) (206,520)
Foreign Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Before Tax (30,896) 38,022 (65,499) 29,034
Tax Effect 2,627 (3,727) 3,128 (4,321)
Net of Tax (28,269) 34,295 (62,371) 24,713
Total, Net of Tax (28,269) 34,295 (62,371) 24,713
Benefit Plan Net Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification, Before Tax 959 2,586 1,919 5,172
Reclassification, Tax Effect (201) (543) (404) (1,086)
Reclassification, Net of Tax 758 2,043 1,515 4,086
Total, Net of Tax $ 758 $ 2,043 $ 1,515 $ 4,086