Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification, Tax Effect		$ 134
Total, Before Tax	$ (329,378)	56,989	$ 39,094
Total, Tax Effect	28,913		(24,103)
Total, Net of Tax	(300,465)	57,123	14,991
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(275,511)	(81,915)	65,645
Tax Effect	21,061	21,597	(13,961)
Net of Tax	(254,450)	(60,318)	51,684
Reclassification, Before Tax	28,014	(7,258)	23,232
Reclassification, Tax Effect	(518)	308	(8,114)
Reclassification, Net of Tax	27,496	(6,950)	15,118
Total, Net of Tax	(1,206)	(4,030)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(1,071)	(5,618)	7,734
Tax Effect	(135)	1,588	(1,789)
Net of Tax	(1,206)	(4,030)	5,945
Total, Net of Tax	(226,954)	(67,268)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(86,520)	142,054	(53,802)
Tax Effect	9,704	(20,137)	(1,539)
Net of Tax	(76,816)	121,917	(55,341)
Total, Net of Tax	(76,816)	121,917
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(646)	1,300	(11,520)
Tax Effect	136	(273)	4,032
Net of Tax	(510)	1,027	(7,488)
Reclassification, Before Tax	6,356	8,426	7,805
Reclassification, Tax Effect	(1,335)	(2,949)	(2,732)
Reclassification, Net of Tax	5,021	5,477	$ 5,073
Total, Net of Tax	$ 4,511	$ 6,504