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Commitments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) ServiceLine	Dec. 31, 2020 USD ($)
Company-Owned Lead Service Lines [Member]
Commitments [Abstract]
Term to replace all remaining company-owned lead service lines	4 years
Customer-Owned Lead Service Lines [Member]
Commitments [Abstract]
Number of lead customer-owned service lines to be replaced annually | ServiceLine	400
Term of tariff modification to replace customer-owned lead service lines	9 years
Recovery period of regulatory asset	4 years
Costs incurred to replace customer-owned lead service lines	$ 1,222	$ 1,204
Costs to be incurred to replace customer-owned lead service lines	$ 1,500

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Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 55
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121594574&loc=d3e44360-110383

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-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- Definition

Amount of costs incurred to date for replacing all of the remaining customer-owned lead service lines connected to company-owned lead service lines under a four-year tariff modification.

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Amount of expected cost remaining for replacing all of the remaining customer-owned lead service lines connected to company-owned lead service lines under a nine-year tariff modification.

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Number of lead customer-owned service lines to be replaced annually whenever they are discovered.

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Term of consent order agreement with the Pennsylvania Department of Environmental Protection involving the replacement of lead customer-owned service lines regardless of material used for company-owned service lines, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period of time within which the Company will replace all of the remaining company-owned lead service lines, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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