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SENIOR NOTES PAYABLE - Additional information (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 21, 2025 | May 31, 2024 | Feb. 29, 2024 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes outstanding, total |  |  |  |  |  |  | $ 1,529,681 |  | $ 1,668,021
Unamortized debt issuance expenses |  |  |  |  |  |  | 9,969 |  | $ 13,130
6.75% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 25,000 | $ 115,492 |  |  |  |  |  |
Redemption price, percentage |  | 100.00% | 100.00% |  |  |  |  |  |
6.375% Senior Notes due 2025 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 185 |
Debt, weighted average interest rate |  |  |  |  | 5.62% |  | 5.62% |  | 5.71%
Interest expense on senior notes total |  |  |  |  | $ 22,617 | $ 25,088 | $ 70,032 | $ 78,091 |
Senior Notes | 6.75% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  | 6.75% | 6.75% | 6.75% |  |  |  |  |
Repurchase shares of common stock (in shares) |  |  |  | 2,356,978 |  |  |  |  |
Repurchase amount |  |  |  | $ 58,924 |  |  |  |  |
Repurchase amount, accrued interest |  | $ 145 | $ 628 | $ 663 |  |  |  |  |
Senior Notes | 6.375% Senior Notes due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.375% |  | 6.375% |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 1,130 |  |
Senior Notes | 6.375% Senior Notes due 2025 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | 6.375% |  |  |  |  |  |  |  |

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