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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 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total, Before Tax $ 271,705 $ (200,031)  
Total, Tax Effect (25,259) 20,149  
Total, Net of Tax 246,446 (179,882)  
URA(D) On Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax 256,630 (209,160)  
Tax Effect (23,391) 18,746  
Net of Tax 233,239 (190,414)  
Reclassification, Before Tax (2,736) (10,325)  
Reclassification, Tax Effect 914 1,553  
Reclassification, Net of Tax (1,822) (8,772)  
Total, Net of Tax 231,417   $ (226,954)
URA(D) On Securities OTTI [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax (244) (189)  
Tax Effect 70 (21)  
Net of Tax (174) (210)  
Total, Net of Tax (174)   (1,206)
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Before Tax 16,598 17,345  
Tax Effect (2,546) 354  
Net of Tax 14,052 17,699  
Total, Net of Tax 14,052   (76,816)
Benefit Plan Net Actuarial Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification, Before Tax 1,457 2,298  
Reclassification, Tax Effect (306) (483)  
Reclassification, Net of Tax 1,151 $ 1,815  
Total, Net of Tax $ 1,151   $ 4,511