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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 199,401	$ (107,370)	$ 471,106	$ (307,401)
Total, Tax Effect	(28,192)	4,006	(53,451)	24,155
Total, Net of Tax	171,209	(103,364)	417,655	(283,246)
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	228,053	(41,271)	484,683	(250,431)
Tax Effect	(28,872)	(906)	(52,263)	17,840
Net of Tax	199,181	(42,177)	432,420	(232,591)
Reclassification, Before Tax	(787)	350		(9,975)
Reclassification, Tax Effect	1,082	(101)		1,452
Reclassification, Net of Tax	(1,869)	249		(8,523)
Total, Net of Tax	197,312	(41,928)	428,729	(241,114)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(1,499)	456	(1,743)	267
Tax Effect	77	(55)	147	(76)
Net of Tax	(1,422)	401	(1,596)	191
Reclassification, Before Tax			(3,523)
Reclassification, Tax Effect			(168)
Reclassification, Net of Tax			(3,691)
Total, Net of Tax	(1,422)	401	(1,596)	191
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(27,823)	(69,202)	(11,225)	(51,857)
Tax Effect	1,991	5,550	(555)	5,904
Net of Tax	(25,832)	(63,652)	(11,780)	(45,953)
Total, Net of Tax	(25,832)	(63,652)	(11,780)	(45,953)
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	0		0
Tax Effect	0		0
Net of Tax	0		0
Reclassification, Before Tax	1,457	2,297	2,914	4,595
Reclassification, Tax Effect	(306)	(482)	(612)	(965)
Reclassification, Net of Tax	1,151	1,815	2,302	3,630
Total, Net of Tax	$ 1,151	$ 1,815	$ 2,302	$ 3,630

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