EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Credit) (Details) - U.K. Plan - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 441	$ 593
Expected return on plan assets	(578)	(607)
Amortization of prior service cost	8	8
Net periodic pension credit	$ (129)	$ (6)