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Business Segments: (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Details of reportable segment          
Total utility plant $ 1,355,663 $ 1,238,789 $ 1,355,663 $ 1,238,789 $ 1,296,310
Other assets 211,620 202,333 211,620 202,333  
Total Assets 1,567,283 1,441,122 1,567,283 1,441,122 1,501,433
GOLDEN STATE WATER COMPANY          
Details of reportable segment          
Depreciation on transportation equipment 96 $ 61 154 $ 121  
Total utility plant 1,337,424   1,337,424   1,281,092
Total Assets $ 1,446,599   $ 1,446,599   $ 1,389,222