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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 1 (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) Subsidiary | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Utility Subsidiary Accounting [Abstract] |  |  |
Number of wholly owned subsidiaries | Subsidiary | 5 |  |
Utility Plant [Abstract] |  |  |
Capitalized rate of AFUDC | 7.40% | 7.70% | 8.10%
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 624,792 | $ 577,447 |
Less - accumulated depreciation | 126,114 | 116,945 |
Utility plant, net | $ 498,678 | $ 460,502 |
Depreciation and Amortization [Abstract] |  |  |
Depreciation rates of water utility plant | 2.28% | 2.27% | 2.25%
Minimum [Member] |  |  |
Depreciation and Amortization [Abstract] |  |  |
Amortization period of other deferred assets | 20 years |  |
Maximum [Member] |  |  |
Depreciation and Amortization [Abstract] |  |  |
Amortization period of other deferred assets | 24 years |  |
Property Held for Future Use [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 0 years |  |
Utility plant, gross | $ 24,395 | $ 14,647 |
Construction in Progress [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 0 years |  |
Utility plant, gross | $ 19,694 | 12,700 |
Utility plant in service-Water [Member] | Mains [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 81 years |  |
Utility plant, gross | $ 267,352 | 252,569 |
Utility plant in service-Water [Member] | Services [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 39 years |  |
Utility plant, gross | $ 45,661 | 42,232 |
Utility plant in service-Water [Member] | Storage Tanks [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 76 years |  |
Utility plant, gross | $ 25,167 | 24,729 |
Utility plant in service-Water [Member] | Meters [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 26 years |  |
Utility plant, gross | $ 26,531 | 25,628 |
Utility plant in service-Water [Member] | Hydrants [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 60 years |  |
Utility plant, gross | $ 14,514 | 13,760 |
Utility plant in service-Water [Member] | Intangible plant [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 0 years |  |
Utility plant, gross | $ 140 | 140 |
Utility plant in service-Water [Member] | Source of supply plant [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 22,320 | 20,959 |
Utility plant in service-Water [Member] | Source of supply plant [Member] | Minimum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 45 years |  |
Utility plant in service-Water [Member] | Source of supply plant [Member] | Maximum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 85 years |  |
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 85,399 | 81,180 |
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] | Minimum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 8 years |  |
Utility plant in service-Water [Member] | Pumping and water treatment plant [Member] | Maximum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 62 years |  |
Utility plant in service-Water [Member] | General plant [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 60,536 | 56,784 |
Utility plant in service-Water [Member] | General plant [Member] | Minimum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 3 years |  |
Utility plant in service-Water [Member] | General plant [Member] | Maximum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 31 years |  |
Utility plant in service-Wastewater [Member] | General plant [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 1,206 | 1,006 |
Utility plant in service-Wastewater [Member] | General plant [Member] | Minimum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 3 years |  |
Utility plant in service-Wastewater [Member] | General plant [Member] | Maximum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 31 years |  |
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 17,635 | 17,421 |
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] | Minimum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 35 years |  |
Utility plant in service-Wastewater [Member] | Treatment and Disposal Plant [Member] | Maximum [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 62 years |  |
Utility plant in service-Wastewater [Member] | Collection Mains & Lift Stations [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 81 years |  |
Utility plant, gross | $ 14,242 | $ 13,692 |

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