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Commitments and Contingent Liabilities (Tables)
9 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of purchased water cost

 

   (In Thousands)
   Three Months Ended  Nine Months Ended
   September 30,  September 30,
   2016  2015  2016  2015
             
Treated  $804   $775   $2,360   $2,271 
Untreated   675    674    1,911    1,869 
Total Costs  $1,479   $1,449   $4,271   $4,140