Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Summary of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)

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Fair Value of Financial Instruments - Summary of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 2,882,285 $ 2,329,044
Net realized gains (losses) (12,204) 7,402
Net change in unrealized appreciation (depreciation) (3,562) (40,376)
Purchases 1,025,931 869,250
Sales (1,909) (88,282)
Repayments (695,856) (314,417)
Gross Transfers into Level 3   207
Gross transfers out of Level 3   (13,868)
Ending balance 3,194,685 2,748,960
Preferred Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 41,488 69,439
Net realized gains (losses) (3,441) 7,966
Net change in unrealized appreciation (depreciation) 1,392 (22,458)
Purchases 2,851 3,614
Sales   (11,101)
Gross transfers out of Level 3   (6,422)
Ending balance 42,290 41,038
Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 25,059 21,968
Net realized gains (losses)   (74)
Net change in unrealized appreciation (depreciation) 10,684 9,462
Purchases 4,500 0
Sales (594) (19)
Gross Transfers into Level 3   207
Gross transfers out of Level 3   (3,942)
Ending balance 39,649 27,602
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 19,419 27,477
Net realized gains (losses) (3,443) 992
Net change in unrealized appreciation (depreciation) 1,539 (13,795)
Purchases 3,711 6,127
Sales (1,108) (3,162)
Ending balance 20,118 17,639
Senior Secured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,741,388 2,156,709
Net realized gains (losses) (5,400) (1,883)
Net change in unrealized appreciation (depreciation) (22,135) (11,377)
Purchases 1,003,953 854,978
Sales   (73,500)
Repayments (695,856) (314,417)
Gross transfers out of Level 3   (3,504)
Ending balance 3,021,950 2,607,006
Unsecured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 54,056 52,890
Net change in unrealized appreciation (depreciation) 4,958 (1,880)
Purchases 10,916 3,383
Ending balance 69,930 54,393
Escrow Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 875 561
Net realized gains (losses) 80 401
Net change in unrealized appreciation (depreciation)   (328)
Purchases   1,148
Sales (207) (500)
Ending balance $ 748 $ 1,282