Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Total, Before Tax	$ 11,884	$ 86,202	$ 29,641	$ 181,264
Total, Tax Effect	(4,160)	(30,171)	(10,374)	(63,446)
Total, Net of Tax	7,724	56,031	19,267	117,818
URA(D) On Securities [Member]
Before Tax	5,784	53,960	23,804	83,916
Tax Effect	(1,753)	(18,886)	(8,060)	(29,370)
Net of Tax	4,031	35,074	15,744	54,546
Reclassification, Before Tax	(4,931)	(97)	(10,265)	39,773
Reclassification, Tax Effect	1,454	34	3,321	(13,921)
Reclassification, Net of Tax	(3,477)	(63)	(6,944)	25,852
Total, Net of Tax			8,800		$ 22,063
URA(D) On Securities - OTTI [Member]
Before Tax	(317)	6,446	(3,816)	6,643
Tax Effect	111	(2,256)	1,336	(2,325)
Net of Tax	(206)	4,190	(2,480)	4,318
Total, Net of Tax			(2,480)		3,324
Foreign Currency Translation Adjustments [Member]
Before Tax	8,265	23,830	13,752	46,807
Tax Effect	(2,893)	(8,341)	(4,813)	(16,386)
Net of Tax	5,372	15,489	8,939	30,421
Total, Net of Tax			8,939		2,849
Benefit Plan Net Gain (Loss) [Member]
Before Tax
Tax Effect
Net of Tax
Reclassification, Before Tax	3,083	2,063	6,166	4,125
Reclassification, Tax Effect	(1,079)	(722)	(2,158)	(1,444)
Reclassification, Net of Tax	$ 2,004	$ 1,341	4,008	$ 2,681
Total, Net of Tax			$ 4,008		$ (2,415)