INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortized intangible assets:
Gross Carrying Value	$ 20,967	$ 18,432
Accumulated Amortization	12,893	11,218
Net Carrying Value	8,074	7,214
Unamortized intangible assets:
Perpetual water rights and other	3,776	3,780
Amortization of intangible assets	1,700	1,600	$ 1,600
Estimated future amortization expense related to intangible assets for the succeeding five years
2019	1,600
2020	1,100
2021	1,100
2022	900
2023	800
Thereafter	2,600
Water pumping rights
Amortized intangible assets:
Gross Carrying Value	1,084	1,084
Accumulated Amortization	112	108
Net Carrying Value	$ 972	976
Water planning studies
Amortized intangible assets:
Weighted Average Amortization Period	9 years
Gross Carrying Value	$ 18,364	15,922
Accumulated Amortization	11,899	10,306
Net Carrying Value	$ 6,465	5,616
Leasehold improvements and other
Amortized intangible assets:
Weighted Average Amortization Period	17 years
Gross Carrying Value	$ 1,519	1,426
Accumulated Amortization	882	804
Net Carrying Value	$ 637	$ 622