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Debt - Convertible Bond Debt (Details)
3 Months Ended 9 Months Ended
Aug. 26, 2022
$ / shares
shares
Jul. 29, 2019
USD ($)
vessel
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
shares
May 25, 2022
USD ($)
Debt Instrument [Line Items]              
Number of vessels acquired | vessel   6          
Repurchase of convertible debt, cash         $ 14,188,000 $ 0  
Loss on debt extinguishment     $ 4,173,000 $ 99,000 $ 4,173,000 $ 99,000  
Weighted average diluted shares, decrease due to repurchases of convertible bond debt (in shares) | shares     3,208,402 3,133,973 3,233,935 3,117,193  
Convertible Bond Debt              
Debt Instrument [Line Items]              
Net proceeds   $ 112,500,000          
Conversion premium per principal amount of notes   1,000         $ 1,000
Convertible Bond Debt | Convertible Debt              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 114,100,000          
Interest Rate Swap detail   5.00%          
Debt issuance costs   $ 1,600,000          
Repurchase of convertible bond debt     $ 10,000,000   $ 10,000,000    
Repurchase of convertible debt, cash         14,200,000    
Loss on debt extinguishment     $ (4,200,000)   $ 4,200,000    
Weighted average diluted shares, decrease due to repurchases of convertible bond debt (in shares) | shares     296,990   296,990    
Conversion premium (in shares) | shares 29.699            
Conversion price (in dollars per share) | $ / shares $ 33.67            
Convertible Bond Debt | Convertible Debt | Debt Instrument, Redemption, Period Two              
Debt Instrument [Line Items]              
Redemption price percentage   100.00%          
Convertible Bond Debt | Convertible Debt | Other Liabilities              
Debt Instrument [Line Items]              
Debt issuance costs   $ 1,000,000          
Credit Default Option | Unsecured Debt              
Debt Instrument [Line Items]              
Amount of principal amount eligible for declaration in case of default   25.00%          
Amount of notes to be due and payable   100.00%