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Interest Rate Swaps (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Interest Rate Swaps    
Term of the interest rate swap agreements 3 years  
Average fixed-rate interest (as a percent) 0.32%  
Notional amount $ 324,100,000  
Interest rate swaps located in current portion of derivative liabilities 402,469 $ 397,418
Interest rate swaps located in non-current portion of derivative liabilities 0 433,974
Not designated as hedging instrument    
Interest Rate Swaps    
Interest rate swaps located in current portion of derivative liabilities (55,057) (48,044)
Interest rate swaps located in non-current portion of derivative liabilities 53,078 (54,212)
Cash flow hedge | Designated as hedging instrument    
Interest Rate Swaps    
Notional amount 273,300,000  
Interest rate swaps located in current portion of derivative liabilities (347,412) (349,374)
Interest rate swaps located in non-current portion of derivative liabilities $ 202,061 $ (379,762)