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Debt - Narrative (Details) € in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2023 EUR (€) | Jan. 31, 2023 USD ($) | Dec. 31, 2022 EUR (€) | Sep. 13, 2022 USD ($) | May 20, 2022 USD ($) | Feb. 11, 2022 USD ($) | Dec. 03, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Outstanding amount | $ 1,725,252 |  | $ 1,249,850 | $ 1,725,252 |  | 1,532,254 | $ 1,249,850 |  |  |  |  |  |  |  |
Available capacity | 693,498 |  | 725,150 | 693,498 |  | $ 738,521 | 725,150 |  |  |  |  |  |  |  |
Unused fee percentage |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 2,420,000 |  | 1,975,000 | $ 2,420,000 |  | $ 2,275,000 | $ 1,975,000 |  |  |  |  |  |  |  |
Weighted average interest rate (excluding unused fees and financing costs) | 6.64% | 4.37% |  | 6.45% | 3.47% | 4.05% | 2.12% | 1.93% |  |  |  |  |  |  |
Weighted average debt | $ 1,619,670 | $ 1,490,571 |  | $ 1,591,671 | $ 1,399,866 | $ 1,432,492 | $ 796,272 | $ 114,431 |  |  |  |  |  |  |
CIBC Substriction Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments for borrowings from lines of credit |  | $ 55,000 |  |  | $ 90,000 | $ 310,350 | 455,000 | 278,500 |  |  |  |  |  |  |
Borrowings from lines of credit |  |  |  |  |  |  | 431,500 | $ 612,350 |  |  |  |  |  |  |
Outstanding amount |  |  | 310,350 |  |  |  | 310,350 |  |  |  |  |  |  |  |
Available capacity |  |  | 89,650 |  |  |  | 89,650 |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | 400,000 |  |  |  | $ 400,000 |  |  |  |  |  |  |  |
Weighted average interest rate (excluding unused fees and financing costs) | 0.00% | 3.76% |  | 0.00% | 2.57% | 3.13% | 1.77% | 1.93% |  |  |  |  |  |  |
CIBC Substriction Facility | Base Rate | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.65% |  | 1.65% |  |  |  |  |  |  |  |  |
CIBC Substriction Facility | Prime Rate | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 0.65% |  | 0.65% |  |  |  |  |  |  |  |  |
BNP Funding Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 600,000 |  |  | $ 600,000 |  | $ 600,000 |  |  |  |  |  |  |  |  |
Repayments for borrowings from lines of credit | 25,000 | $ 83,500 |  | 55,000 | $ 154,500 | 176,500 | $ 75,000 |  |  |  |  |  |  |  |
Borrowings from lines of credit | 0 | $ 0 |  | 0 | $ 13,000 | 113,000 | 538,500 |  |  |  |  |  |  |  |
Outstanding amount | 345,000 |  | 463,500 | 345,000 |  | 400,000 | 463,500 |  |  |  |  |  |  |  |
Available capacity | 255,000 |  | 136,500 | 255,000 |  | 200,000 | 136,500 |  |  |  |  |  |  |  |
Aggregate principal amount | $ 600,000 |  | 600,000 | $ 600,000 |  | $ 600,000 | $ 600,000 |  |  |  |  |  |  |  |
Weighted average interest rate (excluding unused fees and financing costs) | 7.77% | 4.57% |  | 7.34% | 3.37% | 3.90% | 2.48% |  |  |  |  |  |  |  |
BNP Funding Facility | Base Rate | Line of Credit | Low | 1-month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 1.95% |  |  |  |  |  |  |  |  |
BNP Funding Facility | Base Rate | Line of Credit | Low | 3-month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 2.45% |  |  |  |  |  |  |  |  |
BNP Funding Facility | Base Rate | Line of Credit | High | 1-month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.85% |  | 2.75% |  |  |  |  |  |  |  |  |
BNP Funding Facility | Base Rate | Line of Credit | High | 3-month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.35% |  | 3.25% |  |  |  |  |  |  |  |  |
Truist Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,500,000 |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  | $ 1,120,000 |  |  | $ 975,000 |  | $ 975,000
Interest rate |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |
Repayments for borrowings from lines of credit | 90,000 | $ 222,000 |  | 90,000 | $ 773,000 | $ 798,000 | $ 68,000 |  |  |  |  |  |  |  |
Borrowings from lines of credit | 278,000 | $ 127,246 |  | 338,000 | $ 579,246 | 754,246 | 544,000 |  |  |  |  |  |  |  |
Outstanding amount | 680,252 |  | 476,000 | 680,252 |  | 432,254 | 476,000 |  |  |  |  |  |  |  |
Available capacity | 438,498 |  | 499,000 | $ 438,498 |  | 538,521 | 499,000 |  |  |  |  |  |  |  |
Unused fee percentage |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,120,000 |  | $ 975,000 | $ 1,120,000 |  | $ 975,000 | $ 975,000 |  | € 238 |  | € 238 |  |  |  |
Weighted average interest rate (excluding unused fees and financing costs) | 7.26% | 4.05% | 2.09% | 6.91% | 3.05% | 3.68% |  |  |  |  |  |  |  |  |
Truist Credit Facility | Federal Resere Bank of New York Rate | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 0.50% |  | 0.50% |  |  |  |  |  |  |  |  |
Truist Credit Facility | Eurodollar | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.875% |  | 1.875% |  |  |  |  |  |  |  |  |
Truist Credit Facility | Secured Overnight Financing Rate (SOFR) | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.00% |  | 1.00% |  |  |  |  |  |  |  |  |
Truist Credit Facility | Secured Overnight Financing Rate (SOFR) | Line of Credit | Low |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |
Truist Credit Facility | Secured Overnight Financing Rate (SOFR) | Line of Credit | High |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 0.875% |  |  |  |  |  |  |  |  |
2027 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount | $ 425,000 |  |  | $ 425,000 |  | $ 425,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 425,000 |  |  | $ 425,000 |  | $ 425,000 |  |  |  |  |  |  |  | $ 425,000 |
Stated interest rate | 4.50% | 4.50% |  | 4.50% | 4.50% | 4.50% |  |  | 4.50% |  | 4.50% |  |  | 4.50% |
Percentage of holders representing outstanding principal |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.87% |
2025 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount | $ 275,000 |  |  | $ 275,000 |  | $ 275,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 275,000 |  |  | $ 275,000 |  | $ 275,000 |  |  |  |  |  | $ 275,000 |  |  |
Stated interest rate | 7.55% | 7.55% |  | 7.55% | 7.55% | 7.55% |  |  | 7.55% |  | 7.55% | 7.55% |  |  |

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