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Retirement Benefit Plans (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
subsidiary
employee
plan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 03, 2006
plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Number of non-contributory defined benefit pension plans | plan         2
Estimate of amount of unrecognized actuarial expense $ 508        
Number of defined contribution plans | plan 2        
IAM Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Annual contribution amount $ 557 $ 418 $ 408    
Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Underfunded status (1,844) (1,944)      
Supplemental Employee Retirement Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Estimate of amount of unrecognized actuarial expense $ 475        
SERP credited service period 10 years        
Percentage of final 3 year average salary in which retirement benefit is based (percentage) 20.00%        
Number of final years in which the Retirement Benefit is based 3 years        
Retirement age 65 years        
Period of time that vested retirement benefit will be paid after death or change in control 90 days        
Years of monthly installments associated with SERP disability 15 years        
Supplemental Employee Retirement Plan | Minimum          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Current retirement benefit percentage 10.00%        
Supplemental Employee Retirement Plan | Maximum          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Current retirement benefit percentage 20.00%        
Employees’ Retirement Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Former employees | employee 245        
Current employees | employee 64        
Hourly Employees’ Pension Plan | Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Amount of final contribution       $ 622  
Amount expenses of accumulated pension actuarial losses       $ 2,889  
United States          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Annual contribution amount $ 2,806 2,340 1,942    
Foreign Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Annual contribution amount $ 861 $ 850 $ 716    
Number of international subsidiaries that participate in defined contribution and savings plan | subsidiary 3        
Foreign Plan | Minimum          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Employer contribution percentage 0.00%        
Foreign Plan | Maximum          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Employer contribution percentage 10.00%