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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Operations:        
Net investment income (loss) $ 33,233,000 $ 39,580,000 $ 69,782,000 $ 84,504,000
Net realized gain (loss) from investments (1,218,000) (11,509,000) (34,016,000) (8,046,000)
Net realized gain (loss) on derivatives (21,000) 17,000 (40,000) 6,000
Net change in unrealized appreciation (depreciation) on investments (2,633,000) (135,000) 9,005,000 (21,367,000)
Net change in unrealized appreciation (depreciation) on derivatives 148,000 (111,000) 291,000 (349,000)
Net change in deferred taxes (2,981,000) (1,684,000) (23,000) (3,731,000)
Accretion to redemption value of Series A redeemable convertible preferred stock (4,000) (4,000) (9,000) (9,000)
Accrual of Series A redeemable convertible preferred stock distributions (1,226,000) (1,687,000) (2,452,000) (3,373,000)
Net increase (decrease) in net assets resulting from operations attributable to common stockholders 25,298,000 24,467,000 42,538,000 47,635,000
Stockholder distributions:        
Net decrease in net assets attributable to common stock from stockholder distributions (32,035,000) (44,942,000) (64,553,000) (89,645,000)
Capital share transactions:        
Reinvestment of common stockholder distributions (2,000) 9,292,000 6,856,000 19,283,000
Repurchases of common stock (33,950,000) (34,903,000) (33,950,000) (34,903,000)
Net increase (decrease) in net assets attributable to common stock from capital share transactions (33,952,000) (25,611,000) (27,094,000) (15,620,000)
Total increase (decrease) in net assets attributable to common stock (40,689,000) (46,086,000) (49,109,000) (57,630,000)
Net assets at beginning of period attributable to common stock 1,831,650,000 1,898,833,000 1,840,070,000 1,910,377,000
Net assets at end of period attributable to common stock $ 1,790,961,000 $ 1,852,747,000 $ 1,790,961,000 $ 1,852,747,000
Net asset value per share attributable to common stock (in dollar per share) $ 13.42 $ 13.79 $ 13.42 $ 13.79
Common shares outstanding at end of year (in shares) 133,482,448 134,387,297 133,482,448 134,387,297