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Long-term debt, current and non-current, details 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Maturities of Long-term Debt [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 43,304  
Long-term Debt, Maturities, Repayments of Principal in Year Two 43,304  
Long-term Debt, Maturities, Repayments of Principal in Year Three 179,333  
Long-term Debt, Maturities, Repayments of Principal in Year Four 17,376  
Long-term Debt, Maturities, Repayments of Principal in Year Five 165,576  
Long-term Debt, Maturities, Repayments of Principal after Year Five 21,942  
Total debt outstanding $ 470,835 $ 423,056