Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Investment, cost $ 4,114,074,000 [1] $ 3,725,960,000 [2]
Deferred financing costs, accumulated amortization $ 13,370,000 $ 12,329,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 86,552,506 84,830,679
Common stock, shares outstanding (in shares) 86,552,506 84,830,679
July 2026 Notes | Unsecured Notes    
Debt instrument, par value $ 500,000,000 $ 500,000,000
March 2029 Notes | Unsecured Notes    
Debt instrument, par value 350,000,000  
June 2027 Notes | Unsecured Notes    
Debt instrument, par value 300,000,000.0  
SBIC Debentures | Unsecured Notes    
Debt instrument, par value 286,200,000 350,000,000
December 2025 Notes | Unsecured Notes    
Debt instrument, par value 150,000,000 150,000,000
May 2024 Notes | Unsecured Notes    
Debt instrument, par value   450,000,000
Control investments    
Investment, cost 1,484,861,000 [1],[3] 1,435,131,000 [2],[4]
Affiliate investments    
Investment, cost 679,571,000 [1],[5] 575,894,000 [2],[6]
Non‑Control/Non‑Affiliate investments    
Investment, cost $ 1,949,642,000 [1],[7] $ 1,714,935,000 [2],[8]
[1] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[2] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[3] Control investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[4] Control investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[5] Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[6] Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[7] Non-Control/Non-Affiliate investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[8] Non-Control/Non-Affiliate investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.