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Retirement Benefit Plans (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
subsidiary
plan
employee
Dec. 31, 2017
USD ($)
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 $ 542      
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 $ 418 $ 408 $ 435  
Pension Plans, Defined Benefit        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Underfunded status (1,944) (1,225)    
Supplemental Employee Retirement Plans, Defined Benefit        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Estimate of amount of unrecognized actuarial expense $ 317      
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 Plans, Defined Benefit | Minimum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Current retirement benefit percentage 10.00%      
Supplemental Employee Retirement Plans, Defined Benefit | 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 252      
Current employees | employee 67      
Hourly Employees’ Pension Plan | Pension Plans, Defined Benefit        
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 $ 2,340 1,942 1,900  
Foreign Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Annual contribution amount $ 850 $ 716 $ 735  
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%