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Pensions and Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Settlement loss [1] $ 673 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0      
Estimated actuarial items that will be amortized from AOCI loss $ 400               $ 400    
Ultimate health care cost trend rate 4.00%               4.00%    
Defined benefit plan, employer contribution in 2019 $ 1,300               $ 1,300    
Defined contribution plan matching expense                 700 $ 700 $ 700
Accrued pension and other postretirement costs 14,982       16,424       14,982 16,424  
Pension Plans                      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Accrued pension and other postretirement costs 9,421       11,163       9,421 11,163  
Other Retirement Obligations                      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Other retirement obligations 1,300       1,200       1,300 1,200  
Accrued pension and other postretirement costs 4,645       4,726       4,645 4,726  
Non-US | Pension Plans                      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Settlement loss                 700    
Nonqualified Plan | 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 3,100       3,300       3,100 3,300  
Accrued pension and other postretirement costs 4,200       4,400       4,200 4,400  
Unfunded Plan | Nonqualified Plan | Pension Plans                      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Assets held-in-trust 1,600       1,700       1,600 1,700  
Non qualified pension plan liabilities         $ 2,300         $ 2,300  
Unfunded Plan | Nonqualified Plan | United States                      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Non qualified pension plan liabilities $ 2,200               $ 2,200    
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.