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NON-U.S. EMPLOYEE DEFINED BENEFIT PLANS - Expected Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Retirement Benefits [Abstract]  
2018 $ 67
2019 68
2020 49
2021 50
2022 50
2023 to 2027 847
Expected future benefit payments $ 1,131