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Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 542,400	$ (329,378)	$ 56,989
Total, Tax Effect	(51,691)	28,913	134
Total, Net of Tax	490,709	(300,465)	57,123
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	547,539	(275,511)	(81,915)
Tax Effect	(49,665)	21,061	(21,597)
Net of Tax	497,874	(254,450)	(60,318)
Reclassification, Before Tax	(13,129)	28,014	(7,258)
Reclassification, Tax Effect	516	(518)	308
Reclassification, Net of Tax	(12,613)	27,496	(6,950)
Total, Net of Tax	485,261	(226,954)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(1,559)	(1,071)	(5,618)
Tax Effect	115	(135)	1,588
Net of Tax	(1,444)	(1,206)	(4,030)
Total, Net of Tax	(1,444)	(1,206)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	18,585	(86,520)	142,054
Tax Effect	(4,555)	9,704	(20,137)
Net of Tax	14,030	(76,816)	121,917
Total, Net of Tax	14,030	(76,816)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(15,938)	(646)	1,300
Tax Effect	3,347	136	(273)
Net of Tax	(12,591)	(510)	1,027
Reclassification, Before Tax	6,902	6,356	8,426
Reclassification, Tax Effect	(1,449)	(1,335)	(2,949)
Reclassification, Net of Tax	5,453	5,021	$ 5,477
Total, Net of Tax	$ (7,138)	$ 4,511

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