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Business Segments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Details of reportable segment |  |  |
Operating revenues | $ 595,699 | $ 491,528 | $ 498,853
Operating income (loss) | 196,740 | 126,636 | 140,977
Interest expense (income), net | 35,346 | 24,701 | 21,341
Net utility plant | 1,892,280 | 1,753,766 | 1,626,004
Depreciation and amortization expense | 42,403 | 41,315 | 39,596
Income tax benefit | 41,599 | 23,664 | 30,423
Capital additions | $ 188,540 | 166,240 | 144,515
GSWC |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 1 |  |
Operating revenues | $ 433,473 | 340,602 | 347,112
Operating income (loss) | 159,177 | 92,455 | 107,573
Net utility plant | 1,735,534 | 1,616,718 |
Depreciation and amortization expense | 35,886 | 34,805 | 33,384
Income tax benefit | 35,689 | 16,346 | 22,095
Depreciation on transportation equipment | 212 |  |
GSWC | Water |  |  |
Details of reportable segment |  |  |
Operating revenues | 433,473 | 340,602 | 347,112
Operating income (loss) | 159,177 | 92,455 | 107,573
Interest expense (income), net | 25,726 | 21,659 | 21,046
Net utility plant | 1,735,534 | 1,616,718 | 1,499,745
Depreciation and amortization expense | 35,886 | 34,805 | 33,384
Income tax benefit | 35,689 | 16,346 | 22,095
Capital additions | 160,939 | 146,730 | 123,526
BVES | Electric |  |  |
Details of reportable segment |  |  |
Operating revenues | 41,832 | 39,986 | 38,345
Operating income (loss) | 11,196 | 11,740 | 10,738
Interest expense (income), net | 2,238 | 831 | 141
Net utility plant | 140,279 | 119,560 | 106,508
Depreciation and amortization expense | 3,256 | 2,792 | 2,572
Income tax benefit | 1,515 | 2,439 | 2,975
Capital additions | 25,372 | 18,069 | 19,859
American States Utility Services | Contracted services: |  |  |
Details of reportable segment |  |  |
Operating revenues | 120,394 | 110,940 | 113,396
Operating income (loss) | 26,151 | 22,449 | 22,675
Interest expense (income), net | 1,321 | (132) | (637)
Net utility plant | 16,467 | 17,488 | 19,751
Depreciation and amortization expense | 3,261 | 3,718 | 3,640
Income tax benefit | 6,109 | 5,476 | 5,434
Capital additions | 2,229 | 1,441 | 1,130
Golden State Water Company and Bear Valley Electric Service, Inc. |  |  |
Details of reportable segment |  |  |
Depreciation on transportation equipment | $ 851 | 382 | 379
Parent Company |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 3 |  |
Operating revenues | $ 0 | 0 | 0
Interest expense (income), net | 6,061 | 2,343 | 791
Net utility plant | 0 | 0 | 0
Depreciation and amortization expense | 0 | 0 | 0
Income tax benefit | (1,714) | (597) | (81)
Capital additions | 0 | 0 | 0
Parent Company | Intersegment Eliminations |  |  |
Details of reportable segment |  |  |
Operating income (loss) | $ 216 | $ (8) | $ (9)

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