LEASES - Operating Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Lease cost under long-term operating leases	$ 3,262	$ 3,245
Lease cost under short-term operating leases	813	852
Variable lease cost under short-term and long-term operating leases	882	1,212
Total operating lease cost	$ 4,957	$ 5,309