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NON-U.S. EMPLOYEE DEFINED BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 2 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Retirement Benefits [Abstract]    
Service cost $ 68 $ 449
Interest cost 25 150
Expected return on plan assets (8) (45)
Additional charges 4 22
Curtailment gain 0 (510)
Settlement loss 0 3
Net periodic benefit costs $ 89 $ 69