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Debt and Credit Facilities - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 26, 2023
Aug. 11, 2023
Jun. 23, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Nov. 01, 2023
Line of Credit Facility [Line Items]                
Line of credit facility, outstanding       $ 634,977,000   $ 634,977,000    
Interest expense       5,288,000 $ 4,102,000 16,007,000 $ 11,255,000  
Unsecured Debt | Facility                
Line of Credit Facility [Line Items]                
Face amount     $ 150,000,000          
Increase in interest rate in event of default     2.00%          
Outstanding loan balance       150,000,000   150,000,000    
Fair value of debt       151,000,000   151,000,000    
Unamortized issuance costs       200,000   200,000    
Amortization of debt issuance costs       100,000 $ 100,000 100,000 $ 100,000  
Line of Credit | Unsecured Facility                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 415,000,000          
Line of credit facility, outstanding       0   0    
Unused commitment fee percentage     0.225%          
Line of Credit | Unsecured Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 150,000,000          
Line of Credit | Unsecured Facility | Letter of Credit                
Line of Credit Facility [Line Items]                
Stated interest rate     1.50%          
Line of Credit | Bank of Montreal, Letter of Credit Facility | Letter of Credit                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 50,000,000            
Unused commitment fee percentage   0.15%            
Commitment fee percentage   0.40%            
Line of Credit | UBS Letter of Credit Facility | Letter of Credit | Subsequent Event                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity $ 100,000,000              
Commitment fee percentage 1.40%              
Line of Credit | Unsecured Facility, Lloyd's | Letter of Credit                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 205,000,000   $ 205,000,000    
Commitment fee percentage           1.625%    
Line of Credit | Unsecured Facility, Lloyd's | Letter of Credit | Subsequent Event                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 230,000,000
Term of debt agreement               1 year
Secured Overnight Financing Rate (SOFR) | Line of Credit | Unsecured Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     1.85%