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Business Segments: (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Details of reportable segment          
Total utility plant $ 946,740 $ 900,009 $ 946,740 $ 900,009 $ 917,791
Other assets 366,246 352,751 366,246 352,751  
Total Assets 1,312,986 1,252,760 1,312,986 1,252,760 1,280,943
GOLDEN STATE WATER COMPANY
         
Details of reportable segment          
Total utility plant 942,498   942,498   913,137
Total Assets 1,248,489   1,248,489   1,214,052
Depreciation on transportation equipment $ 218 $ 572 $ 468 $ 1,149