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Long-Term Debt and Other Financial Liabilities, Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Annual Principal Payments [Abstract]    
Total $ 207,917 $ 173,289
Long-Term Debt and Other Financial Liabilities [Member]    
Annual Principal Payments [Abstract]    
Twelve month period ending June 30, 2022 32,102  
Twelve month period ending June 30, 2023 63,205  
Twelve month period ending June 30, 2024 30,206  
Twelve month period ending June 30, 2025 27,354  
Thereafter 55,050  
Total $ 207,917