LEASES - Quantitative Information of Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating leases:
Operating lease cost	$ 3,256	$ 2,430
Variable lease cost	56	66
Operating lease expense	3,312	2,496
Short-term lease expense	2,158	1,830
Total lease expense	5,470	4,326
Cash paid for amounts included in the lease liability - operating cash flows from operating leases	5,235	2,440
Right of use assets obtained in exchange for operating lease liabilities	$ 9,376	$ 18,771
Weighted average remaining lease term	24 years 3 months 18 days	16 years 8 months 12 days
Weighted average discount rate	7.30%	6.80%