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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2013
INTANGIBLE ASSETS  
INTANGIBLE ASSETS

4 INTANGIBLE ASSETS

        As of December 31, 2013 and 2012, intangible assets that will continue to be amortized and those not amortized were:

 
   Weighted
Average
Amortization
Period
(years)		   2013   2012  
 
   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   $ 85   $ 999   $ 1,084   $ 79   $ 1,005  

Water planning studies

   11     12,567     5,517     7,040     11,894     4,322     7,572  

Leasehold improvements and other

   22     1,191     411     780     1,140     249     891  
                               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   12   $ 14,842   $ 6,013   $ 8,829   $ 14,118   $ 4,650   $ 9,468  
                               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                               

Unamortized intangible assets:

                                          

Perpetual water rights and other

       $ 3,390   $ —   $ 3,390   $ 4,495   $ —   $ 4,495  

        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, 2013, 2012, and 2011, amortization of intangible assets was $1,354, $1,298, and $1,421, respectively. Estimated future amortization expense related to intangible assets for the succeeding five years is approximately $1,385, $1,333, $1,310, $1,280, 1,248, and $2,452 thereafter.