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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 102,306	$ (26,426)	$ 573,412	$ (333,827)
Total, Tax Effect	(11,133)	1,447	(64,584)	25,602
Total, Net of Tax	91,173	(24,979)	508,828	(308,225)
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	103,247	(24,248)	587,930	(274,679)
Tax Effect	(9,529)	1,963	(61,792)	19,803
Net of Tax	93,718	(22,285)	526,138	(254,876)
Reclassification, Before Tax	(74)	2,175	(3,597)	(7,800)
Reclassification, Tax Effect	(455)	(758)	(623)	694
Reclassification, Net of Tax	(529)	1,417	(4,220)	(7,106)
Total, Net of Tax	93,190	(20,868)	521,919	(261,982)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	72	72	(1,671)	339
Tax Effect	(25)	(69)	122	(145)
Net of Tax	47	3	(1,549)	194
Total, Net of Tax	47	3	(1,549)	194
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(2,665)	(6,723)	(13,890)	(58,580)
Tax Effect	(761)	793	(1,316)	6,697
Net of Tax	(3,426)	(5,930)	(15,206)	(51,883)
Total, Net of Tax	(3,426)	(5,930)	(15,206)	(51,883)
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax
Tax Effect
Net of Tax
Reclassification, Before Tax	1,726	2,298	4,640	6,893
Reclassification, Tax Effect	(363)	(482)	(975)	(1,447)
Reclassification, Net of Tax	1,363	1,816	3,665	5,446
Total, Net of Tax	$ 1,363	$ 1,816	$ 3,665	$ 5,446

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