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Retirement Plans, Defined Contribution Plans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Facility
Dec. 31, 2017
USD ($)
Dec. 31, 2016
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 $ 6,700
Pension Plan [Member]      
Benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 37,757 41,691  
Service cost 1,465 1,939 2,091
Interest cost 1,137 1,222 1,669
Foreign currency exchange rate changes (761) 1,607  
Benefits paid (2,480) (9,633)  
Amendments 145 0  
Actuarial (gain) loss (3,111) 931  
Benefit obligation at end of year 34,152 37,757 41,691
Change in fair value of plan assets [Roll Forward]      
Plan assets at beginning of year 31,768 36,141  
Company contributions 886 1,195  
Foreign currency exchange rate changes (1,315) 2,318  
Benefits paid (2,480) (9,633)  
Actual (loss) gain on plan assets (560) 1,747  
Plan assets at end of year 28,299 31,768 36,141
Funded status (5,853) (5,989)  
Accumulated benefit obligation 33,562 36,951  
Amounts recognized in Consolidated Balance Sheets [Abstract]      
Accrued employee and retiree benefits (15,245) (13,304)  
Other accrued expenses (779) (2,731)  
Other assets 10,171 10,046  
Net liability (5,853) (5,989)  
Components of annual benefit cost [Abstract]      
Service cost 1,465 1,939 2,091
Interest cost 1,137 1,222 1,669
Expected return on plan assets (896) (892) (1,141)
Recognized actuarial (gain) loss (141) (187) 193
Settlement (income) expense (179) 3,796 543
Defined benefit expense $ 1,386 $ 5,878 3,355
Weighted average liability assumptions [Abstract]      
Discount rate 3.80% 3.16%  
Expected return on plan assets 3.21% 3.03%  
Rate of compensation increase 0.31% 0.33%  
Weighted average cost assumption [Abstract]      
Discount rate 3.16% 3.48%  
Expected return on plan assets 3.03% 2.85%  
Rate of compensation increase 0.33% 0.43%  
Estimated Future Benefit Payments [Abstract]      
2019 $ 1,500    
2020 1,500    
2021 1,600    
2022 3,900    
2023 1,600    
2024 through 2028 13,600    
Estimated future employer contributions for next fiscal year 1,100    
Amounts recognized in Accumulated Other Comprehensive Income [Abstract]      
Unrecognized net actuarial (gain) loss (901) $ 1,112  
Prior service cost 145 0  
Total before tax effects (756) 1,112  
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract]      
Net actuarial gain arising during the period 1,257 921 1,312
Prior service cost (127) 0 0
Amortization of actuarial (gain) loss, included in defined benefit expense (103) 1,307 544
Pension adjustment, net of tax 1,027 $ 2,228 $ 1,856
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Expected amortization of actuarial gain in next fiscal year $ 100