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Derivative Instruments - Statement Of Financial Position (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Derivative [Line Items] |  |  |  |
Derivative asset, net, gross fair value | $ (40,149) | $ (50,970) |  |
Derivative assets, net, net fair value | (40,149) | (50,970) | $ 2,839 | $ 21,921
Current derivative assets |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative asset, gross fair value | 281 | 186 |  |
Derivative asset, amounts netted | (198) | (186) |  |
Derivative assets, net fair value | 83 | 0 |  |
Non-current derivative assets |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative asset, gross fair value | 267 | 228 |  |
Derivative asset, amounts netted | 0 | (122) |  |
Derivative assets, net fair value | 267 | 106 |  |
Current derivative liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liability, gross fair value | (31,182) | (42,330) |  |
Derivative liability, amounts netted | 198 | 186 |  |
Derivative liability, net fair value | (30,984) | (42,144) |  |
Non-current derivative liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liability, gross fair value | (9,515) | (9,054) |  |
Derivative liability, amounts netted | 0 | 122 |  |
Derivative liability, net fair value | $ (9,515) | $ (8,932) |  |

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