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Retirement Plans, Defined Contribution Plans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Facility
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
2014 Restructuring Plan [Member]      
Facilities closed associated with defined benefit plan [Abstract]      
Number of facilities closed associated with the defined benefit plan | Facility 2    
Defined Contribution Plan [Member]      
Defined Contribution Plans Disclosure [Abstract]      
Percentage of matching contributions under defined contribution plan 4.00%    
Total expense for defined contribution plans $ 6,000 $ 6,000 $ 6,000
Pension Plan [Member]      
Benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 34,152 37,757  
Service cost 1,432 1,465 1,939
Interest cost 1,273 1,137 1,222
Foreign currency exchange rate changes 558 (761)  
Benefits paid (1,899) (2,480)  
Amendments 0 145  
Actuarial loss (gain) 3,905 (3,111)  
Benefit obligation at end of year 39,421 34,152 37,757
Change in fair value of plan assets [Roll Forward]      
Plan assets at beginning of year 28,299 31,768  
Company contributions 1,086 886  
Foreign currency exchange rate changes 968 (1,315)  
Benefits paid (1,899) (2,480)  
Actual gain (loss) on plan assets 3,322 (560)  
Plan assets at end of year 31,776 28,299 31,768
Funded status (7,645) (5,853)  
Accumulated benefit obligation 38,596 33,562  
Amounts recognized in Consolidated Balance Sheets [Abstract]      
Accrued employee and retiree benefits (17,143) (15,245)  
Other accrued expenses (710) (779)  
Other assets 10,208 10,171  
Net liability (7,645) (5,853)  
Components of annual benefit cost [Abstract]      
Service cost 1,432 1,465 1,939
Interest cost 1,273 1,137 1,222
Expected return on plan assets (896) (896) (892)
Recognized actuarial gain (176) (141) (187)
Settlement (income) expense 0 (179) 3,796
Defined benefit expense $ 1,633 $ 1,386 5,878
Weighted average liability assumptions [Abstract]      
Discount rate 2.69% 3.80%  
Expected return on plan assets 2.68% 3.21%  
Rate of compensation increase 0.34% 0.31%  
Weighted average cost assumption [Abstract]      
Discount rate 3.80% 3.16%  
Expected return on plan assets 3.21% 3.03%  
Rate of compensation increase 0.31% 0.33%  
Estimated Future Benefit Payments [Abstract]      
2020 $ 1,700    
2021 1,700    
2022 4,200    
2023 1,800    
2024 4,100    
2025 through 2029 12,500    
Estimated future employer contributions for next fiscal year 1,100    
Amounts recognized in Accumulated Other Comprehensive Loss [Abstract]      
Unrecognized net actuarial loss (gain) 683 $ (901)  
Prior service cost 146 145  
Total before tax effects 829 (756)  
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract]      
Net actuarial (loss) gain arising during the period (1,091) 1,257 921
Prior service cost 0 (127) 0
Amortization of actuarial (gain) loss, included in defined benefit expense (130) (103) 1,307
Pension adjustment, net of tax (1,221) $ 1,027 $ 2,228
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Expected amortization of actuarial loss in next fiscal year $ (100)