LEASES - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
LEASES
Fixed operating lease expense	$ 5,360	$ 5,360	$ 5,248
Variable operating lease expense	910	926	745
Total operating lease expense	$ 6,270	$ 6,286	$ 5,993