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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