LEASES - Operating Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Lease cost under long-term operating leases	$ 3,275	$ 3,262
Lease cost under short-term operating leases	560	813
Variable lease cost under short-term and long-term operating leases	833	882
Total operating lease cost	$ 4,668	$ 4,957