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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 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:
|  | December 31,
(dollars in thousands) |  | 2018 |  | 2017
GSWC |  |  |  |  |  |
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  | $ | 17,763 |  |  | $ | 29,556 |
Costs deferred for future recovery on Aerojet case |  | 9,516 |  |  | 10,656 |
Pensions and other post-retirement obligations (Note 12) |  | 33,124 |  |  | 33,019 |
Derivative unrealized loss (Note 5) |  | 311 |  |  | 2,941 |
Low income rate assistance balancing accounts |  | 2,784 |  |  | 5,972 |
General rate case memorandum accounts |  | 5,054 |  |  | 10,522 |
Other regulatory assets |  | 15,656 |  |  | 16,393 |
Excess deferred income taxes (Note 11) |  | (81,465 | ) |  | (83,231 | )
Flow-through taxes, net (Note 11) |  | (15,273 | ) |  | (17,716 | )
Tax Cuts and Jobs Act ("Tax Act") memorandum accounts |  | (8,293 | ) |  | — |
Various refunds to customers |  | (7,517 | ) |  | (6,070 | )
Total |  | $ | (28,340 | ) |  | $ | 2,042 |

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