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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total, Before Tax $ (165,904) $ 122,324 $ (367,279) $ 426,931
Total, Tax Effect 12,459 (7,863) 36,113 (43,485)
Total, Net of Tax (153,445) 114,461 (331,166) 383,446
URA(D) On Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Before Tax (107,980) 68,264 (343,137) 373,990
Tax Effect 7,959 (4,784) 38,672 (38,155)
Net of Tax (100,021) 63,480 (304,465) 335,835
Reclassification, Before Tax (809) (12,678) (1,233) 18,650
Reclassification, Tax Effect (579) 1,225 (2,231) (5,961)
Reclassification, Net of Tax (1,388) (11,453) (3,464) 12,689
Total, Net of Tax (101,409) 52,027 (307,929) 348,524
Foreign Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Before Tax (59,094) 64,453 (30,060) 28,555
Tax Effect 5,495 (3,825) 1,174 1,835
Net of Tax (53,599) 60,628 (28,886) 30,390
Total, Net of Tax (53,599) 60,628 (28,886) 30,390
Benefit Plan Net Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification, Before Tax 1,979 2,285 7,151 5,736
Reclassification, Tax Effect (416) (479) (1,502) (1,204)
Reclassification, Net of Tax 1,563 1,806 5,649 4,532
Total, Net of Tax $ 1,563 $ 1,806 $ 5,649 $ 4,532