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Commitments and Contingent Liabilities (Tables)
9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of purchased water cost

Purchased water costs are shown below:

 

   (In Thousands)
   Three Months Ended  Nine Months Ended
   September 30,  September 30,
   2018  2017  2018  2017
             
Treated  $836   $791   $2,427   $2,365 
Untreated   948    673    2,728    1,905 
Total Costs  $1,784   $1,464   $5,155   $4,270