Retirement Plans And Postretirement Benefits (Fair Value Of Assets Of, And The Funded Status Of, Postretirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in Plan Assets:
Fair value of plan assets at beginning of year	$ 115,199
Fair value of plan assets at end of year	126,812	$ 115,199
U.S.
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	126,985	139,746
Service cost	1,297	1,315	$ 1,305
Interest cost	5,070	4,709	5,352
Foreign currency exchange rates	0	0
Actuarial (gain) loss	12,868	(8,297)
Gross benefits paid	(10,410)	(10,488)
Net benefit obligation at end of year	135,810	126,985	139,746
Changes in Plan Assets:
Fair value of plan assets at beginning of year	99,845	109,845
Employer contributions	708	5,579
Gross benefits paid	(10,410)	(10,488)
Fair value of plan assets at end of year	107,832	99,845	109,845
Funded status:	(27,978)	(27,140)
Prior service credit	0	0
Current liabilities	(427)	(430)
Non-current liabilities	(27,551)	(26,710)
Net amount recognized	(27,978)	(27,140)
Foreign [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	22,332	20,407
Service cost	624	674	710
Interest cost	275	253	199
Foreign currency exchange rates	379	(339)
Actuarial (gain) loss	3,319	711
Gross benefits paid	(1,557)	(234)
Net benefit obligation at end of year	28,903	22,332	20,407
Changes in Plan Assets:
Fair value of plan assets at beginning of year	15,354	13,618
Employer contributions	834	726
Gross benefits paid	(1,557)	(234)
Fair value of plan assets at end of year	18,980	15,354	13,618
Funded status:	(9,923)	(6,978)
Prior service credit	0	0
Current liabilities	(43)	(117)
Non-current liabilities	(9,917)	(7,008)
Net amount recognized	(9,923)	(6,978)
Postemployment Retirement Benefit | U.S.
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	7,165	8,461
Service cost	0	0	0
Interest cost	269	264	333
Foreign currency exchange rates		0
Actuarial (gain) loss	(585)	1,028
Gross benefits paid	(829)	(532)
Plan amendment	0	0
Net benefit obligation at end of year	7,190	7,165	8,461
Changes in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Employer contributions	829	532
Gross benefits paid	(829)	(532)
Fair value of plan assets at end of year	0	0	0
Funded status:	(7,190)	(7,165)
Prior service credit	0	0
Current liabilities	(723)	(783)
Non-current liabilities	(6,467)	(6,382)
Net amount recognized	(7,190)	(7,165)
Postemployment Retirement Benefit | Foreign [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	10,661	12,172
Service cost	0	1	2
Interest cost	684	700	653
Foreign currency exchange rates	340	(1,333)
Actuarial (gain) loss	(100)	(47)
Gross benefits paid	(831)	(926)
Plan amendment	0	0
Net benefit obligation at end of year	10,954	10,661	12,172
Changes in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Employer contributions	831	926
Gross benefits paid	(831)	(926)
Fair value of plan assets at end of year	0	0	$ 0
Funded status:	(10,954)	(10,661)
Prior service credit	0	0
Current liabilities	(893)	(851)
Non-current liabilities	(10,061)	(9,810)
Net amount recognized	$ (10,954)	$ (10,661)