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Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount agreed to be returned to ratepayers for effects of the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act, as a reconcilable negative surcharge to bills generated from March 2019 through February 2020

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Percentage of the distribution system improvement charge (DSIC) over the base rate. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing as permitted by the regulatory agency.

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Amount of the distribution system improvement charge (DSIC) revenue. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing as permitted by the regulatory agency.

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Increase (decrease) in revenue recorded as a regulatory liability for the difference in calculated current federal income taxes and deferred federal income taxes on accelerated depreciation associated with the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act.

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Rate Matters (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Rate Matters (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
PPUC [Member]
Rate Matters [Abstract]
Amount agreed to be returned to ratepayers for effects of 2017 Tax Act	$ 2,117		$ 2,117
Revenue recorded as regulatory liability for effects of 2017 Tax Act			(1,191)
Effect of Tax Rate Change [Member]
Liabilities [Abstract]
Regulatory liability	1,314		1,314
Excess Accumulated Deferred Income Tax on Accelerated Depreciation [Member]
Liabilities [Abstract]
Regulatory liability	(123)		(123)
Rate Request Filed on May 30, 2018 [Member] \| PPUC [Member] \| Water [Member]
Rate Matters [Abstract]
Requested increase in annual revenue			6,399
Agreed upon but not yet authorized dollar increase in annual revenues from the PPUC			3,361
Rate Request Filed on May 30, 2018 [Member] \| PPUC [Member] \| Wastewater [Member]
Rate Matters [Abstract]
Requested increase in annual revenue			289
Agreed upon but not yet authorized dollar increase in annual revenues from the PPUC			289
DSIC [Member] \| PPUC [Member]
Rate Matters [Abstract]
Distribution system improvement charge revenue	$ 512	$ 405	$ 1,428	$ 467
DSIC [Member] \| PPUC [Member] \| Maximum [Member]
Rate Matters [Abstract]
Distribution system improvement charge percentage over base rate			5.00%
DSIC [Member] \| PPUC [Member] \| Minimum [Member]
Rate Matters [Abstract]
Distribution system improvement charge percentage over base rate			0.00%