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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 | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 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) | 917 | (832)
Net change in unrealized appreciation (depreciation) | 1,539 | 25,766
Purchases | 502,158 | 364,052
Sales | (16,063) | (312)
Repayments | (174,035) | (209,666)
Gross Transfers into Level 3 | 0 | 0
Gross Transfers out of Level 3 | 0 | 0
Ending balance | 3,499,619 | 3,061,293
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 |
Net change in unrealized appreciation (depreciation) | (2,326) | (1,143)
Purchases | 1,597 |
Ending balance | 52,309 | 40,345
Common Stock |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 41,790 | 25,059
Net change in unrealized appreciation (depreciation) | (1,752) | 5,632
Purchases | 0 |
Sales | 0 | (207)
Ending balance | 40,038 | 30,484
Warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 22,088 | 19,419
Net realized gains (losses) | 904 | (858)
Net change in unrealized appreciation (depreciation) | (2,113) | 1,508
Purchases | 1,232 | 948
Sales | (2,829) | (7)
Ending balance | 19,282 | 21,010
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) | 13 |
Net change in unrealized appreciation (depreciation) | 7,353 |
Purchases | 0 |
Sales | (13,234) |
Ending balance | 5,020 |
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) | 0 |
Net change in unrealized appreciation (depreciation) | (104) | 16,023
Purchases | 498,787 | 362,781
Repayments | (174,035) | (209,666)
Ending balance | 3,312,225 | 2,910,526
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) | 481 | 3,746
Purchases | 542 | 323
Ending balance | $ 70,745 | 58,125
Escrow Receivable |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance |  | 875
Net realized gains (losses) |  | 26
Sales |  | (98)
Ending balance |  | $ 803

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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