INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

As of December 31, 2017 and 2016, intangible assets that will continue to be amortized and those not amortized were:

	Weighted Average Amortization Period (years)	2017						2016
		Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Amortized intangible assets:
Water pumping rights	usage	$	1,084	$	108	$	976	$	1,084	$	105	$	979
Water planning studies	11	15,922		10,306		5,616		15,734		9,307		6,427
Leasehold improvements and other	19	1,426		804		622		1,331		696		635
Total		$	18,432	$	11,218	$	7,214	$	18,149	$	10,108	$	8,041
Unamortized intangible assets:
Perpetual water rights and other		$	3,780	$	—	$	3,780	$	3,776	$	—	$	3,776

Water pumping rights usage is the amount of water pumped from aquifers to be treated and distributed to customers.

For the years ended December 31, 2017 and 2016, amortization of intangible assets was $1.6 million and for the year ended December 31, 2015, amortization of intangible assets was $1.4 million. Estimated future amortization expense related to intangible assets for the succeeding 5 years is approximately $1.4 million in 2018, $1.2 million in 2019, $0.7 million in 2020, $0.6 million in 2021, $0.5 million in 2022, and $2.7 million thereafter.