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Business Segments: (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Details of reportable segment |  |  |  |  |
Total operating revenues | $ 106,901 | $ 113,195 | $ 201,629 | $ 212,005 |
Operating income (loss) | 25,568 | 42,026 | 44,259 | 66,602 |
Interest expense, net | 5,412 | 5,306 | 10,799 | 10,952 |
Utility plant | 1,238,789 | 1,155,203 | 1,238,789 | 1,155,203 | $ 1,204,992
Depreciation and amortization expense | 10,010 | 9,647 | 19,676 | 19,330 |
Income tax expense (benefit) | 4,387 | 14,307 | 6,951 | 21,162 |
Capital additions | 28,418 | 21,902 | $ 58,782 | 45,896 |
AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Golden State Water Company [Member] |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Total operating revenues | 84,574 | 88,346 | $ 158,818 | 165,252 |
Operating income (loss) | 22,645 | 35,229 | 38,942 | 57,105 |
Utility plant | 1,227,371 |  | 1,227,371 |  | $ 1,197,940
Depreciation and amortization expense | 9,430 | 9,394 | 18,764 | 18,832 |
Income tax expense (benefit) | 4,214 | 12,149 | 6,329 | 18,422 |
Reportable Legal Entities | Golden State Water Company [Member] | Water Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 76,733 | 80,734 | 141,145 | 147,138 |
Operating income (loss) | 21,244 | 33,695 | 35,302 | 52,792 |
Interest expense, net | 5,047 | 4,805 | 10,056 | 9,950 |
Utility plant | 1,166,867 | 1,093,104 | 1,166,867 | 1,093,104 |
Depreciation and amortization expense | 8,866 | 8,858 | 17,635 | 17,759 |
Income tax expense (benefit) | 3,909 | 11,710 | 5,558 | 17,195 |
Capital additions | 24,768 | 20,593 | 51,386 | 43,577 |
Reportable Legal Entities | Golden State Water Company [Member] | Electric |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 7,841 | 7,612 | 17,673 | 18,114 |
Operating income (loss) | 1,401 | 1,534 | 3,640 | 4,313 |
Interest expense, net | 353 | 350 | 723 | 725 |
Utility plant | 60,504 | 56,371 | 60,504 | 56,371 |
Depreciation and amortization expense | 564 | 536 | 1,129 | 1,073 |
Income tax expense (benefit) | 305 | 439 | 771 | 1,227 |
Capital additions | 1,150 | 978 | 2,124 | 1,701 |
Reportable Legal Entities | American States Utility Services [Member] | Contracted Services [Member] |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 22,327 | 24,849 | 42,811 | 46,753 |
Operating income (loss) | 2,925 | 6,800 | 5,322 | 9,504 |
Interest expense, net | (71) | 82 | (137) | 156 |
Utility plant | 11,418 | 5,728 | 11,418 | 5,728 |
Depreciation and amortization expense | 580 | 253 | 912 | 498 |
Income tax expense (benefit) | 705 | 2,347 | 1,259 | 3,208 |
Capital additions | 2,500 | 331 | 5,272 | 618 |
Intersegment Eliminations | AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (2) | (3) | (5) | (7) |
Interest expense, net | 83 | 69 | 157 | 121 |
Utility plant | 0 | 0 | 0 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Income tax expense (benefit) | (532) | (189) | (637) | (468) |
Capital additions | $ 0 | $ 0 | $ 0 | $ 0 |

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