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Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) System County | Dec. 31, 2021 USD ($)
Significant Accounting Policies [Abstract] |  |
Number of wastewater collection systems operated | System | 3 |
Number of wastewater collection and treatment systems operated | System | 8 |
Number of counties in which franchised territory is located | County | 3 |
Utility Plant and Depreciation [Abstract] |  |
Utility plant acquisition adjustments | $ 9,178 | $ 3,637
Amortization of utility plant acquisition adjustments | 67 | 67
Utility plant | $ 549,141 | $ 485,750
Effective rate of depreciation | 2.38% | 2.33%
Mains and Accessories [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 265,033 | $ 242,160
Mains and Accessories [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 12 years |
Mains and Accessories [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 86 years |
Services, Meters and Hydrants [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 92,818 | 87,164
Services, Meters and Hydrants [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 14 years |
Services, Meters and Hydrants [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 47 years |
Operations Structures, Reservoirs and Water Tanks [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 87,218 | 73,462
Operations Structures, Reservoirs and Water Tanks [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 10 years |
Operations Structures, Reservoirs and Water Tanks [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 56 years |
Pumping and Treatment Equipment [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 40,038 | 37,209
Pumping and Treatment Equipment [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 5 years |
Pumping and Treatment Equipment [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 34 years |
Office, Transportation and Operating Equipment [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 18,128 | 16,856
Office, Transportation and Operating Equipment [Member] | Minimum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 2 years |
Office, Transportation and Operating Equipment [Member] | Maximum [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Remaining life | 21 years |
Land and Other Non-Depreciable Assets [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 3,938 | 3,714
Utility Plant in Service [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | 507,173 | 460,565
Construction Work in Progress [Member] |  |
Utility Plant and Depreciation [Abstract] |  |
Utility plant | $ 41,968 | $ 25,185

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