INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortized intangible assets:
Gross Carrying Value	$ 18,432	$ 18,149
Accumulated Amortization	11,218	10,108
Net Carrying Value	7,214	8,041
Unamortized intangible assets:
Perpetual water rights and other	3,780	3,776
Amortization of intangible assets	1,600	1,600	$ 1,400
Estimated future amortization expense related to intangible assets for the succeeding five years
2018	1,400
2019	1,200
2020	700
2021	600
2022	500
Thereafter	2,700
Water pumping rights
Amortized intangible assets:
Gross Carrying Value	1,084	1,084
Accumulated Amortization	108	105
Net Carrying Value	$ 976	979
Water planning studies
Amortized intangible assets:
Weighted Average Amortization Period	11 years
Gross Carrying Value	$ 15,922	15,734
Accumulated Amortization	10,306	9,307
Net Carrying Value	$ 5,616	6,427
Leasehold improvements and other
Amortized intangible assets:
Weighted Average Amortization Period	19 years
Gross Carrying Value	$ 1,426	1,331
Accumulated Amortization	804	696
Net Carrying Value	$ 622	$ 635