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Regulatory Matters: (Tables) | 6 Months Ended
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Jun. 30, 2018
Regulated Operations [Abstract] |
Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations | Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:
(dollars in thousands) |  | June 30, 2018 |  | December 31, 2017
GSWC |  |  |  |
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  | $ | 29,604 |  |  | $ | 29,556 |
Costs deferred for future recovery on Aerojet case |  | 10,272 |  |  | 10,656 |
Pensions and other post-retirement obligations (Note 8) |  | 31,705 |  |  | 33,019 |
Derivative unrealized loss (Note 5) |  | 1,710 |  |  | 2,941 |
Low income rate assistance balancing accounts |  | 4,982 |  |  | 5,972 |
General rate case memorandum accounts |  | 8,241 |  |  | 10,522 |
Excess deferred income taxes (Note 7) |  | (82,128 | ) |  | (83,231 | )
Flow-through taxes, net (Note 7) |  | (16,508 | ) |  | (17,716 | )
Other regulatory assets |  | 15,677 |  |  | 14,875 |
Various refunds to customers |  | (14,354 | ) |  | (4,552 | )
Total |  | $ | (10,799 | ) |  | $ | 2,042 |

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