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Long-Term Debt and Other Financial Liabilities, Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Long-Term Debt and Other Financial Liabilities [Abstract]    
Long-term debt and other financial liabilities $ 207,917 $ 173,289
Less: Deferred finance costs and debt discounts (4,088) (3,527)
Total 203,829 169,762
Less - current portion (30,616) (19,417)
Long-term portion $ 173,213 $ 150,345