EMPLOYER SPONSORED BENEFIT PLANS - Foreign Pension Plans and Post-Retirement Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Loss recognized in accumulated other comprehensive loss, net of tax	$ 2,528	$ (19,173)	$ 4,204
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Net benefit obligation in excess of plan assets	5,981	5,274
Loss recognized in accumulated other comprehensive loss, net of tax	940	861
Postretirement Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Net benefit obligation in excess of plan assets	4,215	3,621
Loss recognized in accumulated other comprehensive loss, net of tax	$ 165	$ (360)