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Summary of Significant Accounting Policies - Revenue Recognition (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Revenues $ 131,900,000 $ 135,600,000 $ 118,100,000 $ 113,700,000 $ 127,900,000 $ 184,500,000 $ 195,600,000 $ 191,700,000 $ 499,267,834 $ 699,706,906
Deferred costs 2,000,000       2,300,000       2,000,000 2,300,000
Voyage revenue                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Revenues $ 122,300,000 $ 127,900,000 $ 110,500,000 $ 108,000,000.0 $ 117,300,000 $ 173,200,000 $ 173,200,000 $ 176,300,000 $ 468,580,914 $ 640,033,668