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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investment Company, Net Assets [Roll Forward]                  
Beginning balance (in shares)   106,067,070   107,916,166   65,316,085 106,067,070 107,916,166 65,316,085
Beginning balance   $ 1,196,559   $ 1,192,329   $ 741,931 $ 1,196,559 $ 1,192,329 $ 741,931
Net investment income $ 29,514 29,353 $ 33,531 27,427     131,194 128,125 115,656
Net realized gain (loss) on investments / foreign currency transactions / forward currency contracts             (38,112) (62,750) 12,861
Net unrealized appreciation (depreciation) on investments / CSAs / foreign currency transactions / forward currency contracts             17,207 62,624 (123,041)
Provision from (benefit for) income taxes             0 0 (795)
Return of capital, merger and other tax related adjustments             0 0 0
Distributions of net investment income $ (27,445) $ (27,578) $ (27,657) $ (26,979) $ (25,999) $ (15,023) (110,052) (108,997) (93,726)
Deemed contribution — from Adviser (See Note 9)                 72,130
Issuance of common stock in connection with acquisition of Sierra                 499,418
Purchase of shares in repurchase plan             $ (6,442) $ (14,772) $ (32,105)
Ending balance (in shares) 105,408,938   106,067,070   107,916,166   105,408,938 106,067,070 107,916,166
Ending balance $ 1,190,354   $ 1,196,559   $ 1,192,329   $ 1,190,354 $ 1,196,559 $ 1,192,329
Common Stock                  
Investment Company, Net Assets [Roll Forward]                  
Beginning balance (in shares)   106,067,070   107,916,166   65,316,085 106,067,070 107,916,166 65,316,085
Beginning balance   $ 106   $ 108   $ 65 $ 106 $ 108 $ 65
Issuance of common stock in connection with acquisition of Sierra (in shares)                 45,986,926
Issuance of common stock in connection with acquisition of Sierra                 $ 46
Purchases of shares in repurchase plan (in shares)             658,132 (1,849,096) (3,386,845)
Purchase of shares in repurchase plan             $ (1) $ (2) $ (3)
Ending balance (in shares) 105,408,938   106,067,070   107,916,166   105,408,938 106,067,070 107,916,166
Ending balance $ 105   $ 106   $ 108   $ 105 $ 106 $ 108
Additional paid-in capital                  
Investment Company, Net Assets [Roll Forward]                  
Beginning balance   1,854,457   1,855,975   1,027,687 1,854,457 1,855,975 1,027,687
Return of capital, merger and other tax related adjustments             (1,039) 13,252 288,888
Deemed contribution — from Adviser (See Note 9)                 72,130
Issuance of common stock in connection with acquisition of Sierra                 499,372
Purchase of shares in repurchase plan             (6,441) (14,770) (32,102)
Ending balance 1,846,977   1,854,457   1,855,975   1,846,977 1,854,457 1,855,975
Total Distributable Earnings (Loss)                  
Investment Company, Net Assets [Roll Forward]                  
Beginning balance   $ (658,004)   $ (663,754)   $ (285,821) (658,004) (663,754) (285,821)
Net investment income             131,194 128,125 115,656
Net realized gain (loss) on investments / foreign currency transactions / forward currency contracts             (38,112) (62,750) 12,861
Net unrealized appreciation (depreciation) on investments / CSAs / foreign currency transactions / forward currency contracts             17,207 62,624 (123,041)
Provision from (benefit for) income taxes                 (795)
Return of capital, merger and other tax related adjustments             1,039 (13,252) (288,888)
Distributions of net investment income             (110,052) (108,997) (93,726)
Ending balance $ (656,728)   $ (658,004)   $ (663,754)   $ (656,728) $ (658,004) $ (663,754)