EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Credit) (Details) - Foreign Plan - Pension Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 23	$ 0	$ 70
Interest cost	561	563	1,740	1,752
Expected return on plan assets	(574)	(909)	(1,781)	(2,827)
Amortization of unrecognized prior service cost	8	0	24	0
Net periodic pension credit	$ (5)	$ (323)	$ (17)	$ (1,005)