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Pensions and Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, employer contribution next fiscal year $ 1,200    
Ultimate health care cost trend rate 4.04%    
Defined contribution plan matching expense $ 1,200 $ 1,100 $ 1,000
Accrued pension and other postretirement costs 7,276 7,777  
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Assets held-in-trust 4,300 3,900  
Accrued pension and other postretirement costs 5,600 5,300  
Other Retirement Obligations      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actuarial gains adjustment $ (95) $ 453  
Ultimate health care cost trend rate 6.50% 6.50%  
Other retirement obligations $ 500 $ 900  
Accrued pension and other postretirement costs 2,204 2,197  
United States | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Assets held-in-trust 1,600 1,500  
Non qualified pension plan liabilities 2,100 2,100  
Actuarial gains adjustment (59) 533  
Accrued pension and other postretirement costs 1,958 1,913  
Foreign Plan | Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actuarial gains adjustment (6) 7,125  
Accrued pension and other postretirement costs $ 2,636 $ 2,727