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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands | Oct. 01, 2019 | Aug. 01, 2019 | May 01, 2019 | Feb. 01, 2019 | Jan. 01, 2019
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Peach State Gas System |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Approved revenue increase |  |  |  | $ 2,367 |
New England Natural Gas System |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Approved revenue increase |  |  | $ 2,413 |  |
Empire Electric System Kansas |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Approved revenue increase |  | $ 2,449 |  |  |
Empire Electric System Oklahoma |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Approved revenue increase | $ 1,400 |  |  |  |
CalPeco Electric System |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Approved revenue increase |  |  |  |  | $ 3,525

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