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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 | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 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] | (9,469) | 1,612
Net Change in Unrealized Appreciation (Depreciation) | [2] | 34,352 | (30,587)
Purchases | [3] | 653,225 | 610,419
Sales |  | 753 | 80,837
Repayments | [4] | 524,679 | 164,254
Gross Transfers into Level 3 | [5] |  | 207
Gross Transfers out of Level 3 | [5] |  | (13,868)
Ending Balance |  | 3,034,961 | 2,651,736
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] | (5,845) | (1,883)
Net Change in Unrealized Appreciation (Depreciation) | [2] | 19,330 | (16,525)
Purchases | [3] | 648,729 | 599,596
Sales |  |  | 73,500
Repayments | [4] | 524,679 | 164,254
Gross Transfers out of Level 3 | [5] |  | 3,504
Ending Balance |  | 2,878,923 | 2,496,639
Escrow Receivables |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 875 | 561
Net Realized Gains (Losses) | [1] | 80 | 312
Net Change in Unrealized Appreciation (Depreciation) | [2] |  | (0)
Purchases | [3] |  | 167
Sales |  | 152 | 398
Ending Balance |  | 803 | 642
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] | 4,276 | (2,025)
Purchases | [3] | 687 | 3,362
Ending Balance |  | 59,019 | 54,227
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] | (1,941) | 2,867
Net Change in Unrealized Appreciation (Depreciation) | [2] | (1,702) | (14,157)
Purchases | [3] |  | 2,903
Sales |  |  | 4,772
Gross Transfers out of Level 3 | [5] |  | 6,422
Ending Balance |  | 41,249 | 49,858
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] |  | (93)
Net Change in Unrealized Appreciation (Depreciation) | [2] | 8,322 | 10,240
Purchases | [3] | 1,000 | 0
Sales |  | 594 | 0
Gross Transfers into Level 3 | [5] |  | 207
Gross Transfers out of Level 3 | [5] |  | 3,942
Ending Balance |  | 33,787 | 28,380
Warrants |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 19,419 | 27,477
Net Realized Gains (Losses) | [1] | (1,763) | 409
Net Change in Unrealized Appreciation (Depreciation) | [2] | 722 | 8,120
Purchases | [3] | 2,809 | 4,391
Sales |  | 7 | 2,167
Ending Balance |  | $ 21,180 | $ 21,990
[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 six months ended June 30, 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 six months ended June 30, 2022 related to the decline of liquidity of Kaleido Biosciences, Inc. shares.

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