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Business Segments: (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Details of reportable segment |  |  |  |  |
Revenues | $ 124,182 | $ 124,418 | $ 325,811 | $ 336,423 |
Operating income (loss) | 33,975 | 38,534 | 78,234 | 105,136 |
Interest expense, net | 5,307 | 5,454 | 16,106 | 16,406 |
Utility plant | 1,262,915 | 1,181,616 | 1,262,915 | 1,181,616 | $ 1,204,992
Depreciation and amortization expense | 10,118 | 9,854 | 29,794 | 29,184 |
Income tax expense (benefit) | 6,939 | 12,508 | 13,890 | 33,670 |
Capital additions | 28,546 | 32,000 | $ 87,328 | 77,896 |
AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Golden State Water Company |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 95,564 | 99,913 | $ 254,382 | 265,165 |
Number of reportable segments | segment |  |  | 2 |  |
Operating income (loss) | 27,540 | 32,986 | $ 66,482 | 90,091 |
Utility plant | 1,249,190 |  | 1,249,190 |  | $ 1,197,940
Depreciation and amortization expense | 9,623 | 9,509 | 28,387 | 28,341 |
Income tax expense (benefit) | 5,414 | 10,813 | 11,743 | 29,235 |
Golden State Water Company | Water Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 87,689 |  | 228,834 |  |
Golden State Water Company | Electric |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 7,875 |  | 25,548 |  |
Reportable Legal Entities | Golden State Water Company | Water Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 87,689 | 91,919 | 228,834 | 239,057 |
Operating income (loss) | 26,710 | 31,408 | 62,012 | 84,200 |
Interest expense, net | 5,039 | 4,974 | 15,095 | 14,924 |
Utility plant | 1,187,786 | 1,117,674 | 1,187,786 | 1,117,674 |
Depreciation and amortization expense | 9,058 | 8,972 | 26,693 | 26,731 |
Income tax expense (benefit) | 5,247 | 10,544 | 10,805 | 27,739 |
Capital additions | 24,590 | 30,536 | 75,976 | 74,113 |
Reportable Legal Entities | Golden State Water Company | Electric |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 7,875 | 7,994 | 25,548 | 26,108 |
Operating income (loss) | 830 | 1,578 | 4,470 | 5,891 |
Interest expense, net | 291 | 346 | 1,014 | 1,071 |
Utility plant | 61,404 | 57,669 | 61,404 | 57,669 |
Depreciation and amortization expense | 565 | 537 | 1,694 | 1,610 |
Income tax expense (benefit) | 167 | 269 | 938 | 1,496 |
Capital additions | 1,140 | 559 | 3,264 | 2,260 |
Reportable Legal Entities | American States Utility Services | Contracted Services |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 28,618 | 24,505 | 71,429 | 71,258 |
Operating income (loss) | 6,437 | 5,551 | 11,759 | 15,055 |
Interest expense, net | (118) | 58 | (255) | 214 |
Utility plant | 13,725 | 6,273 | 13,725 | 6,273 |
Depreciation and amortization expense | 495 | 345 | 1,407 | 843 |
Income tax expense (benefit) | 1,606 | 1,944 | 2,865 | 5,152 |
Capital additions | 2,816 | 905 | 8,088 | 1,523 |
Intersegment Eliminations | AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (2) | (3) | (7) | (10) |
Interest expense, net | 95 | 76 | 252 | 197 |
Utility plant | 0 | 0 | 0 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Income tax expense (benefit) | (81) | (249) | (718) | (717) |
Capital additions | $ 0 | $ 0 | $ 0 | $ 0 |

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