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Business Segments: (Details 2) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Details of reportable segment          
Total utility plant $ 968,459,000 $ 912,027,000 $ 968,459,000 $ 912,027,000 $ 917,791,000
Other assets 382,594,000 377,611,000 382,594,000 377,611,000  
Total Assets 1,351,053,000 1,289,638,000 1,351,053,000 1,289,638,000 1,280,943,000
GOLDEN STATE WATER COMPANY
         
Details of reportable segment          
Total utility plant 964,425,000   964,425,000   913,137,000
Total Assets 1,274,514,000   1,274,514,000   1,214,052,000
Depreciation on transportation equipment $ 214,000 $ 484,000 $ 682,000 $ 1,633,000