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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, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Service cost $ 68 $ 335 $ 449
Interest cost 25 140 150
Expected return on plan assets (8) (14) (45)
Plan asset expenses 4 21 22
Curtailment charge (credit) 0 13 (510)
Settlement charge 0 115 3
Net periodic benefit costs $ 89 $ 610 $ 69