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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
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total, Before Tax $ (334,581) $ 271,705
Total, Tax Effect 36,678 (25,259)
Total, Net of Tax (297,903) 246,446
URA(D) On Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Before Tax (315,200) 256,630
Tax Effect 35,802 (23,391)
Net of Tax (279,398) 233,239
Reclassification, Before Tax 38,177 (2,736)
Reclassification, Tax Effect (6,778) 914
Reclassification, Net of Tax 31,399 (1,822)
Total, Net of Tax (247,999) 231,417
URA(D) On Securities OTTI [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Before Tax (244)
Tax Effect 70
Net of Tax (174)
Total, Net of Tax (174)
Foreign Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Before Tax (58,723) 16,598
Tax Effect 7,899 (2,546)
Net of Tax (50,824) 14,052
Total, Net of Tax (50,824) 14,052
Benefit Plan Net Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Before Tax
Tax Effect
Net of Tax
Reclassification, Before Tax 1,165 1,457
Reclassification, Tax Effect (245) (306)
Reclassification, Net of Tax 920 1,151
Total, Net of Tax $ 920 $ 1,151