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Derivatives (Narrative) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Derivatives, Fair Value [Line Items] |  |
Initial margin | $ 900,000 | $ 1,100,000
Net broker receivable | 1,600,000 | 900,000
Increase (Decrease) in Margin Deposits Outstanding | $ 700,000 | $ 200,000

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