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Margin Accounts, Derivatives and Fair Value Measures - Interest Rate Caps (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
numberOfContract
numberOfVessel
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchase of derivative instrument   $ 628,000 $ 0
London Interbank Offered Rate (LIBOR) Swap Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Variable rate   3.25%  
Interest Rate Cap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of interest rate cap contracts | numberOfContract 4    
Derivative, notional amount $ 22,800,000    
Purchase of derivative instrument $ 628,000    
Number of new building vessels | numberOfVessel 4