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LEASES - Undiscounted future lease payments for operating and finance leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Operating Leases    
2020 (excluding the three-months ended March 31, 2019) $ 2,806  
2021 3,450  
2022 3,482  
2023 3,068  
2024 2,791  
2025 and thereafter 17,692  
Total lease payments 33,289  
Less imputed interest (5,175)  
Total 28,114 $ 28,463
Finance Leases    
2020 (excluding the three-months ended March 31, 2020) 1,938  
2021 296  
Total lease payments 2,234  
Less imputed interest (25)  
Total $ 2,209 $ 1,485