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Long-term debt - Maturities of long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Long-term debt.    
2020 $ 17,963  
2021 12,058  
2022 2,157  
2023 555  
Total long-term debt $ 32,733 $ 37,906