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NON-U.S. EMPLOYEE DEFINED BENEFIT PLANS - Accumulated Benefit Obligation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Aggregate projected benefit obligation $ 11,784 $ 10,848  
Aggregate accumulated benefit obligation 7,759 7,152  
Aggregate fair value of plan assets $ 1,830 $ 3,842 $ 3,893