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Expected Future Benefit Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]      
2018 $ 768    
2019 999    
2020 1,234    
2021 1,430    
2022 1,169    
2023-2026 8,320    
Total $ 13,920    
Defined Benefit Plan, Sponsor Location [Extensible List] us-gaap:ForeignPlanMember us-gaap:ForeignPlanMember us-gaap:ForeignPlanMember