LEASES - Undiscounted future lease payments for operating and finance leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Operating Leases
2021 (excluding the three-months ended March 31, 2021)	$ 2,804
2022	3,109
2023	2,377
2024	1,890
2027	1,601
2026 and thereafter	11,588
Total lease payments	23,369
Less imputed interest	(3,709)
Total	19,660	$ 20,513
Finance Leases
2021 (excluding the three-months ended March 31, 2021)	1,370
2022	257
2023	11
2024	3
Total lease payments	1,641
Less imputed interest	(10)
Total	$ 1,631	$ 823