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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 - Level 3 significant unobservable inputs - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | $ 2,882,285 | $ 2,329,044
Net Realized Gains (Losses) | [1] | (832) | 1,153
Net Change in Unrealized Appreciation (Depreciation) | [2] | 25,766 | (13,113)
Purchases | [3] | 364,052 | 300,778
Sales |  | 312 | 6,185
Repayments | [4] | 209,666 | 97,672
Gross Transfers into Level 3 | [5] |  | 207
Gross Transfers out of Level 3 | [5] |  | 13,868
Ending Balance |  | 3,061,293 | 2,500,344
Senior Secured |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 2,741,388 | 2,156,709
Net Realized Gains (Losses) | [1] |  | (2,010)
Net Change in Unrealized Appreciation (Depreciation) | [2] | 16,023 | (8,696)
Purchases | [3] | 362,781 | 292,683
Repayments | [4] | 209,666 | 97,672
Gross Transfers out of Level 3 | [5] |  | 3,504
Ending Balance |  | 2,910,526 | 2,337,510
Escrow Receivables |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 875 | 561
Net Realized Gains (Losses) | [1] | 26 | 277
Net Change in Unrealized Appreciation (Depreciation) | [2] |  | (0)
Purchases | [3] |  | 167
Sales |  | 98 | 345
Ending Balance |  | 803 | 660
Unsecured Debt |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 54,056 | 52,890
Net Change in Unrealized Appreciation (Depreciation) | [2] | 3,746 | (259)
Purchases | [3] | 323 | 1,201
Ending Balance |  | 58,125 | 53,832
Preferred Note |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 41,488 | 69,439
Net Realized Gains (Losses) | [1] |  | 2,867
Net Change in Unrealized Appreciation (Depreciation) | [2] | (1,143) | (6,513)
Purchases | [3] |  | 2,903
Sales |  |  | 4,772
Gross Transfers out of Level 3 | [5] |  | 6,422
Ending Balance |  | 40,345 | 57,502
Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 25,059 | 21,968
Net Realized Gains (Losses) | [1] |  | (0)
Net Change in Unrealized Appreciation (Depreciation) | [2] | 5,632 | 2,241
Purchases | [3] |  | 0
Sales |  | 207 | 0
Gross Transfers into Level 3 | [5] |  | 207
Gross Transfers out of Level 3 | [5] |  | 3,942
Ending Balance |  | 30,484 | 20,474
Warrant |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 19,419 | 27,477
Net Realized Gains (Losses) | [1] | (858) | 19
Net Change in Unrealized Appreciation (Depreciation) | [2] | 1,508 | 114
Purchases | [3] | 948 | 3,824
Sales |  | 7 | 1,068
Ending Balance |  | $ 21,010 | $ 30,366
[1] | Included in net realized gains (losses) in the accompanying Consolidated Statements of Operations.
[2] | Included in net change in unrealized appreciation (depreciation) in the ac companying Consoli dated Statements of Operations.
[3] | Amounts listed above are inclusive of loan origination fees received at the inception of the loan which are deferred and amortized into fee income as well as the accretion of existing loan discounts and fees during the period. Escrow receivable purchases may include additions due to proceeds held in escrow from the liquidation of level 3 investments. Amounts are net of purchases assigned to the Adviser Funds.
[4] | Amounts listed above include the acceleration and payment of loan discounts and loan fees due to early payoffs or restructures along with regularly scheduled amortization.
[5] | Transfers out of Level 3 during the three months ended March 31, 2022, related to the initial public offerings of Gelesis, Inc., Pineapple Energy, LLC, and the conversion of Level 3 debt investments into common stock investments. Transfers into Level 3 during the three months ended March 31, 2022 related to the decline of liquidity of Kaleido Biosciences, Inc. shares.

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