LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in measurement of liabilities:
Operating cash flows from operating leases	$ 4	$ 33
Operating cash flows from finance leases	670	790
Financing cash flows from finance leases	2,992	4,150
ROU assets obtained in exchange for lease liabilities:
Operating leases	$ 170
Finance leases		$ 1,184