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Commitments	6 Months Ended
Commitments	Jun. 30, 2021
Commitments [Abstract]
Commitments	7. Commitments The Company entered into a consent order agreement with the Pennsylvania Department of Environmental Protection in December 2016 after the Company determined it exceeded the action level for lead as established by the Lead and Copper Rule, or LCR, issued by the U.S. Environmental Protection Agency. The Company did not have an exceedance in any subsequent compliance test. Under the agreement, the Company successfully completed its commitment to exceed the LCR replacement schedule by replacing all the known company-owned lead service lines within four years from the agreement. Any additional company-owned lead service lines that are discovered will be replaced and included in utility plant but are not expected to have a material impact on the financial position of the Company. The Company was granted approval by the Pennsylvania Public Utility Commission, or PPUC, to modify its tariff to include the cost of the annual replacement of up to 400 lead customer-owned service lines over nine years from the agreement. The tariff modification allows the Company to replace customer-owned service lines at its own initial cost. The Company will record the costs as a regulatory asset to be recovered in future base rates to customers, over a four-year period. The cost for the customer-owned lead service line replacements was approximately $1,258 and $1,204 through June 30, 2021 and December 31, 2020, respectively, and is included as a regulatory asset. Based on its experience, the Company estimates that lead customer-owned service lines replacements will cost $1,500. This estimate is subject to adjustment as more facts become available.