LEASES - Undiscounted future lease payments for operating and finance leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating Leases
2021 (excluding the six-months ended June 30, 2021)	$ 1,879
2022	3,180
2023	2,417
2024	1,892
2025	1,601
2026 and thereafter	11,588
Total lease payments	22,557
Less imputed interest	(3,549)
Total	19,008	$ 20,513
Finance Leases
2021 (excluding the six-months ended June 30, 2021)	1,389
2022	367
2023	11
2024	3
Total lease payments	1,770
Less imputed interest	(9)
Total	$ 1,761	$ 823