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Debt - Schedule of Long-Term Debt (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 13, 2022
Feb. 11, 2022
Debt Instrument [Line Items]                    
Amortization of deferred financing costs       $ 2,313,000 $ 2,885,000 $ 3,735,000 $ 2,913,000 $ 1,072,000    
Total $ 29,686,000 $ 18,601,000   $ 84,260,000 $ 42,731,000 $ 67,182,000 $ 21,015,000 $ 3,725,000    
Weighted average interest rate (excluding unused fees and financing costs) 6.64% 4.37%   6.45% 3.47% 4.05% 2.12% 1.93%    
CIBC Substriction Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Borrowing interest expense $ 0 $ 2,271,000   $ 0 $ 5,450,000 $ 8,312,000 $ 6,379,000 $ 2,247,000    
Facility unused commitment fees 0 6,000   0 19,000 26,000 92,000 406,000    
Amortization of deferred financing costs 0 327,000   0 1,125,000 1,347,000 1,375,000 1,072,000    
Total $ 0 $ 2,604,000   $ 0 $ 6,594,000 $ 9,685,000 $ 7,846,000 $ 3,725,000    
Weighted average interest rate (excluding unused fees and financing costs) 0.00% 3.76%   0.00% 2.57% 3.13% 1.77% 1.93%    
Weighted average outstanding balance $ 0 $ 236,491,000   $ 0 $ 279,562,000 $ 262,184,000 $ 354,810,000 $ 114,431,000    
BNP Funding Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Borrowing interest expense 6,904,000 4,517,000   20,862,000 10,665,000 15,376,000 8,559,000      
Facility unused commitment fees 209,000 128,000   455,000 209,000 507,000 69,000      
Amortization of deferred financing costs 297,000 289,000   840,000 855,000 1,145,000 1,073,000 147,000    
Total $ 7,410,000 $ 4,934,000   $ 22,157,000 $ 11,729,000 $ 17,028,000 $ 9,701,000 $ 147,000    
Weighted average interest rate (excluding unused fees and financing costs) 7.77% 4.57%   7.34% 3.37% 3.90% 2.48%      
Weighted average outstanding balance $ 347,446,000 $ 386,962,000   $ 374,927,000 $ 417,700,000 $ 389,216,000 $ 340,437,000      
Truist Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Borrowing interest expense 10,613,000 4,018,000 $ 2,145,000 27,086,000 7,485,000 11,959,000        
Facility unused commitment fees 531,000 568,000 858,000 1,723,000 1,863,000 2,487,000        
Amortization of deferred financing costs 518,000 267,000 465,000 1,473,000 905,000 1,243,000        
Total $ 11,662,000 $ 4,853,000 $ 3,468,000 $ 30,282,000 $ 10,253,000 $ 15,689,000        
Weighted average interest rate (excluding unused fees and financing costs) 7.26% 4.05% 2.09% 6.91% 3.05% 3.68%        
Weighted average outstanding balance $ 572,225 $ 388,313 $ 218,189,000 $ 516,745 $ 323,300 $ 320,955,000        
2027 Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Borrowing interest expense 4,781,000 4,781,000   14,344,000 12,219,000 17,000,000        
Accretion of original issuance discount 54,000 54,000   160,000 136,000 190,000        
Amortization of debt issuance costs 283,000 279,000   839,000 704,000 996,000        
Total $ 5,118,000 $ 5,114,000   $ 15,343,000 $ 13,059,000 $ 18,186,000        
Stated interest rate 4.50% 4.50%   4.50% 4.50% 4.50%       4.50%
2025 Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Borrowing interest expense $ 5,191,000 $ 1,038,000   $ 15,572,000 $ 1,038,000 $ 6,229,000        
Amortization of debt issuance costs 305,000 58,000   906,000 58,000 365,000        
Total $ 5,496,000 $ 1,096,000   $ 16,478,000 $ 1,096,000 $ 6,594,000        
Stated interest rate 7.55% 7.55%   7.55% 7.55% 7.55%     7.55%