Retirement Plans And Postretirement Benefits (Fair Asset Values Of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 126,812	$ 115,199
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,524	1,978
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	995	958
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,985	14,396
Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106,308	97,867
U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	107,832	99,845	$ 109,845
U.S. | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,524	1,978
U.S. | Level 1 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,524	1,978
U.S. | Level 2 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. | Level 3 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,980	15,354	$ 13,618
Foreign [Member] | Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	995	958
Foreign [Member] | Fixed Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,985	14,396
Foreign [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign [Member] | Level 1 [Member] | Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign [Member] | Level 1 [Member] | Fixed Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	995	958
Foreign [Member] | Level 2 [Member] | Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	995	958
Foreign [Member] | Level 2 [Member] | Fixed Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,985	14,396
Foreign [Member] | Level 3 [Member] | Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign [Member] | Level 3 [Member] | Fixed Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,985	14,396
Foreign [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 18,980	$ 15,354