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FAIR VALUE MEASUREMENTS - Level III Rollforward (Details) - 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] |  |
Fair value, beginning of period | $ 3,117,354 | $ 2,828,035
Purchases of investments | 192,430 | 139,034
Proceeds from principal repayments and sales of investments | (95,766) | (89,636)
Accretion of discount/amortization of premium | 2,684 | 2,502
Payment-in-kind | 3,226 | 1,003
Transfers into/(out) of Level 3 | 3,622 | (16,189)
Fair value, end of period | 3,219,673 | 2,866,154
Net change in unrealized appreciation (depreciation) from investments still held | 1,009 | 1,285
Net change in unrealized appreciation (depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | $ 1,748 | $ 1,283
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments | Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments | Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments
Net realized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | $ (5,625) | $ 122
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net realized gain (loss) on non-controlled/non-affiliated investments | Net realized gain (loss) on non-controlled/non-affiliated investments
First Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | $ 2,979,870 | $ 2,668,749
Purchases of investments | 189,612 | 130,460
Proceeds from principal repayments and sales of investments | (85,316) | (89,636)
Accretion of discount/amortization of premium | 2,510 | 2,433
Payment-in-kind | 2,493 | 382
Transfers into/(out) of Level 3 | 3,622 | 0
Fair value, end of period | 3,093,759 | 2,713,691
Net change in unrealized appreciation (depreciation) from investments still held | 6,024 | 1,183
First Lien Debt | Net change in unrealized appreciation (depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 6,593 | 1,181
First Lien Debt | Net realized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (5,625) | 122
Second Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 96,848 | 122,891
Purchases of investments | 836 | 8,500
Proceeds from principal repayments and sales of investments | (10,450) | 0
Accretion of discount/amortization of premium | 172 | 67
Payment-in-kind | 135 | 133
Transfers into/(out) of Level 3 | 0 | (16,189)
Fair value, end of period | 82,186 | 115,410
Net change in unrealized appreciation (depreciation) from investments still held | (5,525) | 8
Second Lien Debt | Net change in unrealized appreciation (depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (5,355) | 8
Second Lien Debt | Net realized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 0 | 0
Other Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 40,636 | 36,395
Purchases of investments | 1,982 | 74
Proceeds from principal repayments and sales of investments | 0 | 0
Accretion of discount/amortization of premium | 2 | 2
Payment-in-kind | 598 | 488
Transfers into/(out) of Level 3 | 0 | 0
Fair value, end of period | 43,728 | 37,053
Net change in unrealized appreciation (depreciation) from investments still held | 510 | 94
Other Investments | Net change in unrealized appreciation (depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 510 | 94
Other Investments | Net realized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | $ 0 | $ 0

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