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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) Subsidiary | Dec. 31, 2014 USD ($) | Dec. 31, 2013
Utility Subsidiary Accounting [Abstract] |  |  |
Number of wholly owned subsidiaries | Subsidiary | 5 |  |
Utility Plant [Abstract] |  |  |
Capitalized rate of AFUDC | 8.10% | 8.20% | 8.20%
Summary of utility plant comprises [Abstract] |  |  |
Utility plant, gross | $ 510,356 | $ 491,725 |
Utility plant, at original cost (less accumulated depreciation) | 104,750 | 97,932 |
Utility plant, net | $ 405,606 | $ 393,793 |
Depreciation and Amortization [Abstract] |  |  |
Depreciation rates of water utility plant | 2.30% | 2.30% | 2.30%
Minimum [Member] |  |  |
Depreciation and Amortization [Abstract] |  |  |
Amortization period of other deferred assets | 2 years |  |
Maximum [Member] |  |  |
Depreciation and Amortization [Abstract] |  |  |
Amortization period of other deferred assets | 40 years |  |
Property Held for Future Use [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 0 years |  |
Utility plant, gross | $ 14,345 | $ 14,440 |
Construction in Progress [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 0 years |  |
Utility plant, gross | $ 3,809 | 3,180 |
Utility plant in service-Water [Member] | Mains [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 81 years |  |
Utility plant, gross | $ 224,104 | 216,174 |
Utility plant in service-Water [Member] | Services [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 39 years |  |
Utility plant, gross | $ 36,060 | 34,708 |
Utility plant in service-Water [Member] | Storage Tanks [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 76 years |  |
Utility plant, gross | $ 23,992 | 23,943 |
Utility plant in service-Water [Member] | Meters [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 26 years |  |
Utility plant, gross | $ 24,150 | 22,460 |
Utility plant in service-Water [Member] | Hydrants [Member] |  |  |
Summary of utility plant comprises [Abstract] |  |  |
Estimated useful life | 60 years |  |
Utility plant, gross | $ 12,037 | 11,540 |
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 | $ 19,313 | 19,029 |
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 | $ 77,221 | 73,432 |
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 | $ 52,434 | 52,081 |
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 | $ 906 | 883 |
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 | $ 14,012 | 12,815 |
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 | $ 7,833 | $ 6,900 |

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