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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands		1 Months Ended
	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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- Definition

Public Utilities, Approved Revenue Increase (Decrease), Amount

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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