LEASES - Supplemental cash flow information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 3,081	$ 3,026
Operating cash outflows from finance leases	33	43
Financing cash outflows from finance leases	2,500	1,497
ROU assets obtained in exchange for lease obligations:
Finance leases	2,231	2,499
Operating leases	$ 2,117	$ 27,965