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DEBT - Schedule of Debt Obligations (Details) € in Thousands, $ in Thousands | Mar. 31, 2024 USD ($) | Mar. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Sep. 13, 2022 USD ($) | Feb. 11, 2022 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Committed | $ 2,420,000 |  | $ 2,420,000 |  |  |
Outstanding Principal | 1,492,257 |  | 1,502,263 |  |  |
Unused Portion | 923,745 |  | 917,484 |  |  |
BNP Funding Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Committed | 600,000 |  | 600,000 |  |  |
Outstanding Principal | 300,000 |  | 282,000 |  |  |
Unused Portion | 300,000 |  | 318,000 |  |  |
Truist Credit Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Committed | 1,120,000 | € 238 | 1,120,000 | € 238 |  |
Outstanding Principal | 492,257 |  | 520,263 |  |  |
Unused Portion | 623,745 |  | 599,484 |  |  |
Outstanding letters of credit | 3,998 |  | 253 |  |  |
2027 Notes | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Committed | 425,000 |  | 425,000 |  |  | $ 425,000
Outstanding Principal | 425,000 |  | 425,000 |  |  |
Unused Portion | 0 |  | 0 |  |  |
Unamortized debt issuance costs | 3,219 |  | 3,499 |  |  |
Unamortized original issuance discount | 614 |  | 667 |  |  |
2025 Notes | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Committed | 275,000 |  | 275,000 |  | $ 275,000 |
Outstanding Principal | 275,000 |  | 275,000 |  |  |
Unused Portion | 0 |  | 0 |  |  |
Unamortized debt issuance costs | 1,763 |  | 2,065 |  |  |
Unamortized original issuance discount | $ 0 |  | $ 0 |  |  |

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