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v3.24.3

Long-Term Debt - Additional Information (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) Contract | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Apr. 30, 2024 USD ($)
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of long-term debt |  | $ 83,700 | $ 250,000 |
Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Pollution control bonds |  |  |  | $ 83,700
3.875% Due in 2032 and 2034 | Interest Rate Swap [Member] | First Mortgage [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of interest rate swaps settled | Contract | 2 |  |  |
Notional amount | $ 20,000 |  |  |
Net payments from settlement of derivatives | $ 4,400 |  |  |
2032 | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate percentage |  |  |  | 3.875%
Closure of Pollution Control Bonds |  |  |  | $ 66,700
2034 | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate percentage |  |  |  | 3.875%
Closure of Pollution Control Bonds |  |  |  | $ 17,000

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