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Investments - Composition of the Company's Investment Portfolio, at Amortized Cost and Fair Value (with Corresponding Percentage of Total Portfolio Investments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Investments    
Amortized Cost $ 525,658 [1] $ 510,876 [2]
Fair Value $ 500,889 [1],[3] $ 488,386 [2],[4]
Investment Owned, At Cost | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 100.00% 100.00%
Senior secured loans    
Investments    
Amortized Cost $ 409,506 $ 393,723
Fair Value $ 404,051 $ 388,882
Senior secured loans | Investment Owned, At Cost | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 77.90% 77.10%
Senior secured loans | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 80.70% 79.60%
Unitranche secured loans    
Investments    
Amortized Cost $ 6,057 $ 13,740
Fair Value $ 6,091 $ 13,877
Unitranche secured loans | Investment Owned, At Cost | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 1.10% 2.70%
Unitranche secured loans | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 1.20% 2.80%
Junior secured loans    
Investments    
Amortized Cost $ 29,832 $ 29,372
Fair Value $ 27,427 $ 26,594
Junior secured loans | Investment Owned, At Cost | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 5.70% 5.80%
Junior secured loans | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 5.50% 5.50%
LLC equity interest in SLF    
Investments    
Amortized Cost $ 42,650 $ 42,650
Fair Value $ 32,990 $ 33,122
LLC equity interest in SLF | Investment Owned, At Cost | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 8.10% 8.30%
LLC equity interest in SLF | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 6.60% 6.80%
Equity securities    
Investments    
Amortized Cost $ 37,613 $ 31,391
Fair Value $ 30,330 $ 25,911
Equity securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 7.20% 6.10%
Equity securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Investments    
Concentration risk, percentage 6.00% 5.30%
[1] All of the Company’s investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940 (the “1940 Act”), unless otherwise noted. All of the Company’s investments are issued by U.S. portfolio companies unless otherwise noted.
[2] All of the Company's investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940 (the “1940 Act”), unless otherwise noted. All of the Company's investments are issued by U.S. portfolio companies unless otherwise noted.
[3] Because there is no readily available market value for these investments, the fair value of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements).
[4] Because there is no readily available market value for these investments, the fair value of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements.)