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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
As of December 31, 2020 and 2019, intangible assets that will continue to be amortized and those not amortized were:
 Weighted
Average
Amortization
Period
(years)		20202019
 Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value		Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value
Amortized intangible assets:       
Water pumping rightsusage$1,084 $122 $962 $1,084 $116 $968 
Water planning studies1220,686 14,119 6,567 18,475 12,950 5,525 
Leasehold improvements and other211,930 1,206 724 1,519 889 630 
Total $23,700 $15,447 $8,253 $21,078 $13,955 $7,123 
Unamortized intangible assets:       
Perpetual water rights and other $3,867 $— $3,867 $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 year ended December 31, 2020, 2019, and 2018, amortization of intangible assets was $1.1 million, $1.5 million, $1.7 million, respectively.
Estimated future amortization expense related to intangible assets are shown in the table below:
Year Ending December 31,Estimated Future Amortization Expense Related to Intangible Assets
2021$1,168 
20221,055 
2023867 
2024726 
2025599 
Thereafter3,838 
Total$8,253