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Leases - Maturities of operating lease liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Leases    
2020, excluding the nine months ended September 30, 2020 $ 1,301  
2021 4,559  
2022 3,309  
2023 2,270  
2024 1,505  
Thereafter 2,830  
Total lease payments 15,774  
Less imputed interest (1,344)  
Present value of lease liabilities $ 14,430 $ 20,615