PENSION PLAN - Weighted Average Assumptions and Net Periodic Pension Cost (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2014
Weighted average assumptions used to determine the benefit obligation
Discount rate	2.50%	3.24%	4.23%	4.46%
Components of net periodic pension cost
Interest cost	$ 365	$ 392	$ 352
Expected return on plan assets	(438)	(407)	(372)
Amortization of net actuarial loss	420	271	306
Net periodic pension cost	$ 347	$ 256	$ 286
Weighted average assumptions used to determine net periodic pension cost
Discount rate	2.50%	3.24%	3.55%
Expected long-term rate of return on plan assets	6.75%	6.75%	6.75%