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Retirement Plans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Facility
Dec. 31, 2016
USD ($)
Dec. 31, 2015
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 $ 6,700 $ 5,400
Pension Plan [Member]      
Benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 41,691 46,359  
Service cost 1,939 2,091 2,692
Interest cost 1,222 1,669 1,803
Foreign currency exchange rate changes 1,607 (2,306)  
Benefits paid (9,633) (8,280)  
Actuarial loss 931 1,906  
Other 0 252  
Benefit obligation at end of year 37,757 41,691 46,359
Change in fair value of plan assets [Roll Forward]      
Plan assets at beginning of year 36,141 36,236  
Company contributions 1,195 6,947  
Foreign currency exchange rate changes 2,318 (3,714)  
Benefits paid (9,633) (8,280)  
Actual gain on plan assets 1,747 4,952  
Plan assets at end of year 31,768 36,141 36,236
Funded status (5,989) (5,550)  
Accumulated benefit obligation 36,951 40,743  
Amounts recognized in Consolidated Balance Sheets [Abstract]      
Accrued employee and retiree benefits (13,304) (14,510)  
Other accrued expenses (2,731) (765)  
Other assets 10,046 9,725  
Net liability (5,989) (5,550)  
Components of annual benefit cost [Abstract]      
Service cost 1,939 2,091 2,692
Interest cost 1,222 1,669 1,803
Expected return on plan assets (892) (1,141) (1,210)
Recognized actuarial (gain) loss (187) 193 228
Settlement expense 3,796 543 1,119
Curtailment gain 0 0 (104)
Defined benefit expense $ 5,878 $ 3,355 4,528
Weighted average liability assumptions [Abstract]      
Discount rate 3.16% 3.48%  
Expected return on plan assets 3.03% 2.85%  
Rate of compensation increase 0.33% 0.43%  
Weighted average cost assumption [Abstract]      
Discount rate 3.48% 3.94%  
Expected return on plan assets 2.85% 3.40%  
Rate of compensation increase 0.43% 0.35%  
Estimated Future Benefit Payments [Abstract]      
2018 $ 3,700    
2019 1,700    
2020 1,800    
2021 1,800    
2022 4,100    
2023 through 2027 14,400    
Estimated future employer contributions for next fiscal year 3,000    
Amounts recognized in Accumulated Other Comprehensive Income [Abstract]      
Unrecognized net actuarial loss 1,112 $ 3,384  
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract]      
Net actuarial gain (loss) arising during the period 921 1,312 (140)
Amortization of actuarial loss, included in defined benefit expense 1,307 544 917
Pension adjustment, net of tax 2,228 1,856 $ 777
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)    
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 31,768 36,141  
Pension Plan [Member] | Level 1 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 7,204 6,832  
Pension Plan [Member] | Level 2 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 24,564 29,309  
Pension Plan [Member] | Level 3 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 0 0  
Pension Plan [Member] | Domestic [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 6,226 5,830  
Pension Plan [Member] | Domestic [Member] | Level 1 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 6,226 5,830  
Pension Plan [Member] | Domestic [Member] | Level 2 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 0 0  
Pension Plan [Member] | Domestic [Member] | Level 3 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 0 0  
Pension Plan [Member] | International [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 101 254  
Pension Plan [Member] | International [Member] | Level 1 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 0 106  
Pension Plan [Member] | International [Member] | Level 2 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 101 148  
Pension Plan [Member] | International [Member] | Level 3 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 0 0  
Pension Plan [Member] | International Fixed Income Funds [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 25,340 23,156  
Pension Plan [Member] | International Fixed Income Funds [Member] | Level 1 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 934 851  
Pension Plan [Member] | International Fixed Income Funds [Member] | Level 2 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 24,406 22,305  
Pension Plan [Member] | International Fixed Income Funds [Member] | Level 3 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 0 0  
Pension Plan [Member] | Other Investments [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 101 6,901  
Pension Plan [Member] | Other Investments [Member] | Level 1 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 44 45  
Pension Plan [Member] | Other Investments [Member] | Level 2 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value 57 6,856  
Pension Plan [Member] | Other Investments [Member] | Level 3 [Member]      
Pension Plan Assets by Asset Category [Abstract]      
Total assets at fair value $ 0 $ 0