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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands |  | 1 Months Ended
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Aug. 01, 2019 | Feb. 28, 2019
Peach State Gas System |  |
Regulatory Liabilities [Line Items] |  |
Approved revenue increase |  | $ 2,367
Subsequent Event | Woodmark/Tall Timbers |  |
Regulatory Liabilities [Line Items] |  |
Approved revenue increase | $ 484 |

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- Details
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