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Business Segments: (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) segment | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Details of reportable segment |  |  |  |  |
Revenues | $ 128,414 | $ 121,278 | $ 245,474 | $ 230,355 |
Operating income (loss) | 37,847 | 35,716 | 68,176 | 61,415 |
Interest expense, net | (5,684) | (4,832) | (11,487) | (10,324) |
Net property, plant and equipment | 1,570,633 | 1,456,398 | 1,570,633 | 1,456,398 | $ 1,512,043
Depreciation and amortization | 9,770 | 9,031 | 19,330 | 17,842 |
Income tax expense | 7,462 | 8,281 | 13,376 | 12,182 |
Capital additions | 39,054 | 29,043 | $ 76,147 | 62,587 |
AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |
Details of reportable segment |  |  |  |  |
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment |  | 83 |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Revenues | 91,633 | 94,753 | $ 166,662 | 177,145 |
Operating income (loss) | 30,777 | 30,175 | 51,836 | 52,267 |
Net property, plant and equipment | 1,450,519 |  | 1,450,519 |  | $ 1,400,489
Depreciation and amortization | 8,213 | 8,209 | 16,275 | 16,238 |
Income tax expense | 5,957 | 7,309 | 9,725 | 10,537 |
GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 91,633 | 87,074 | $ 166,662 | 158,498 |
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues |  | 7,679 |  | 18,647 |
ASUS | Contracted Services |  |  |  |  |
Details of reportable segment |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  | 50 years |  |
Bear Valley Electric Service, Inc. | Electric Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 8,108 |  |  |  |
Golden State Water Company and Bear Valley Electric Service Inc. |  |  |  |  |
Details of reportable segment |  |  |  |  |
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment | 94 |  | $ 189 | 165 |
Golden State Water Company and Bear Valley Electric Service Inc. | Electric Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues |  |  | 19,647 |  |
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 91,633 | 87,074 | 166,662 | 158,498 |
Operating income (loss) | 30,777 | 28,662 | 51,836 | 47,267 |
Interest expense, net | (5,464) | (4,857) | (11,175) | (9,990) |
Net property, plant and equipment | 1,450,519 | 1,353,671 | 1,450,519 | 1,353,671 |
Depreciation and amortization | 8,213 | 7,601 | 16,275 | 15,023 |
Income tax expense | 5,957 | 6,970 | 9,725 | 9,348 |
Capital additions | 31,985 | 22,076 | 63,809 | 50,535 |
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues |  | 7,679 |  |  |
Operating income (loss) |  | 1,513 |  |  |
Interest expense, net |  | (139) |  |  |
Net property, plant and equipment |  | 80,343 |  | 80,343 |
Depreciation and amortization |  | 608 |  |  |
Income tax expense |  | 339 |  |  |
Capital additions |  | 5,500 |  |  |
Reportable Legal Entities | ASUS | Contracted Services |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 28,673 | 26,525 | 59,165 | 53,210 |
Operating income (loss) | 5,278 | 5,543 | 11,102 | 9,152 |
Interest expense, net | 88 | (220) | 317 | 297 |
Net property, plant and equipment | 21,618 | 22,384 | 21,618 | 22,384 |
Depreciation and amortization | 915 | 822 | 1,774 | 1,604 |
Income tax expense | 1,271 | 1,301 | 2,662 | 2,049 |
Capital additions | 653 | 1,467 | 1,140 | 2,998 |
Reportable Legal Entities | Bear Valley Electric Service, Inc. | Electric Service Utility Operations |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 8,108 |  | 19,647 | 18,647 |
Operating income (loss) | 1,795 |  | 5,243 | 5,000 |
Interest expense, net | (88) |  | (174) | (465) |
Net property, plant and equipment | 98,496 | 80,343 | 98,496 | 80,343 |
Depreciation and amortization | 642 |  | 1,281 | 1,215 |
Income tax expense | 458 |  | 1,342 | 1,189 |
Capital additions | 6,416 |  | 11,198 | 9,054 |
Intersegment Eliminations | AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (3) | (2) | (5) | (4) |
Interest expense, net | 220 | 56 | 455 | 166 |
Net property, plant and equipment | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Income tax expense | (224) | (329) | (353) | (404) |
Capital additions | $ 0 | $ 0 | $ 0 | $ 0 |

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