EMPLOYEE BENEFIT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan [Abstract]
Service cost for benefits earned during the period	$ 159	$ 219
Interest cost on pension benefit obligation	2,919	3,364
Expected return on assets	(4,005)	(4,434)
Prior service cost	35	0
Amortization of unrecognized losses	2,061	2,057
Net periodic pension cost	$ 1,169	$ 1,206