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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) - Significant Unobservable Inputs (Level 3) - Recurring - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 3,185,103 | $ 2,882,285
Net realized gains (losses) | (8,685) | (9,469)
Net change in unrealized appreciation (depreciation) | (24,792) | 34,352
Purchases | 867,008 | 653,225
Sales | (21,478) | (753)
Repayments | (493,121) | (524,679)
Gross Transfers into Level 3 | 4,093 | 0
Gross Transfers out of Level 3 | (4,093) | 0
Ending balance | 3,504,035 | 3,034,961
Preferred Stock |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 53,038 | 41,488
Net realized gains (losses) | 0 | (1,941)
Net change in unrealized appreciation (depreciation) | (10,541) | 1,702
Purchases | 1,597 | 0
Gross Transfers into Level 3 | 2,431 |
Ending balance | 46,525 | 41,249
Common Stock |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 41,790 | 25,059
Net realized gains (losses) | (89) |
Net change in unrealized appreciation (depreciation) | (2,018) | 8,322
Purchases | 4,100 | 1,000
Sales | 0 | (594)
Gross Transfers into Level 3 | 1,662 |
Ending balance | 45,445 | 33,787
Warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 22,088 | 19,419
Net realized gains (losses) | 464 | (1,763)
Net change in unrealized appreciation (depreciation) | (4,509) | 722
Purchases | 2,454 | 2,809
Sales | (2,829) | (7)
Ending balance | 17,668 | 21,180
Senior Secured Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 2,987,577 | 2,741,388
Net realized gains (losses) | (9,120) | (5,845)
Net change in unrealized appreciation (depreciation) | (17,797) | 19,330
Purchases | 856,973 | 648,729
Repayments | (493,121) | (524,679)
Gross Transfers out of Level 3 | (4,093) |
Ending balance | 3,320,419 | 2,878,923
Unsecured Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 69,722 | 54,056
Net change in unrealized appreciation (depreciation) | 527 | 4,276
Purchases | 1,841 | 687
Ending balance | 72,090 | 59,019
Escrow and Other Investment Receivables |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 10,888 |
Net realized gains (losses) | 60 |
Net change in unrealized appreciation (depreciation) | 9,546 |
Purchases | 43 |
Sales | (18,649) |
Ending balance | $ 1,888 |
Escrow Receivable |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance |  | 875
Net realized gains (losses) |  | 80
Sales |  | (152)
Ending balance |  | $ 803

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