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Business Segments (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Details of reportable segment |  |  |  |  |
Operating revenues |  |  | $ 498,853 | $ 488,243 | $ 473,869
Operating Income |  |  | 140,977 | 130,499 | 127,073
Interest expense, net |  |  | (21,341) | (20,730) | (21,337)
Net utility plant | $ 1,512,043 |  | 1,626,004 | 1,512,043 | 1,415,705
Depreciation and amortization expense |  |  | 39,596 | 36,850 | 35,397
Income Tax Expense (Benefit) |  |  | 30,423 | 28,197 | 24,670
Capital additions |  |  | $ 144,515 | 130,423 | 151,940
Parent Company |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Operating revenues |  |  | $ 0 | 0 | 0
Operating Income |  |  | (9) | (9) | (9)
Interest expense, net |  |  | (791) | (330) | (539)
Net utility plant | 0 |  | 0 | 0 | 0
Depreciation and amortization expense |  |  | 0 | 0 | 0
Income Tax Expense (Benefit) |  |  | (81) | (208) | (709)
Capital additions |  |  | $ 0 | 0 | 0
GSWC |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |
Operating revenues |  |  | $ 347,112 | 349,284 | 359,378
Operating Income |  |  | 107,573 | 102,896 | 105,092
Net utility plant | 1,400,489 |  | 1,499,745 | 1,400,489 |
Depreciation and amortization expense |  |  | 33,384 | 32,184 | 32,441
Income Tax Expense (Benefit) |  |  | 22,095 | 21,704 | 20,177
GSWC | Water Service Utility Operations [Member] |  |  |  |  |
Details of reportable segment |  |  |  |  |
Operating revenues |  |  | 347,112 | 330,637 | 319,830
Operating Income |  |  | 107,573 | 97,896 | 93,895
Interest expense, net |  |  | (21,046) | (20,312) | (20,304)
Net utility plant | 1,400,489 |  | 1,499,745 | 1,400,489 | 1,322,062
Depreciation and amortization expense |  |  | 33,384 | 30,969 | 29,956
Income Tax Expense (Benefit) |  |  | 22,095 | 20,515 | 17,295
Capital additions |  |  | 123,526 | 107,355 | 131,353
GSWC | Electric: |  |  |  |  |
Details of reportable segment |  |  |  |  |
Operating revenues |  | $ 18,647 |  | 37,024 | 39,548
Operating Income |  |  |  | 10,303 | 11,197
Interest expense, net |  |  |  | (584) | (1,228)
Net utility plant | 89,308 |  |  | 89,308 | 72,680
Depreciation and amortization expense |  |  |  | 2,479 | 2,485
Income Tax Expense (Benefit) |  |  |  | 2,689 | 2,882
Capital additions |  |  |  | 18,393 | 11,499
American States Utility Services | Contracted services: |  |  |  |  |
Details of reportable segment |  |  |  |  |
Operating revenues |  |  | 113,396 | 120,582 | 114,491
Operating Income |  |  | 22,675 | 22,309 | 21,990
Interest expense, net |  |  | 637 | 496 | 734
Net utility plant | 22,246 |  | 19,751 | 22,246 | 20,963
Depreciation and amortization expense |  |  | 3,640 | 3,402 | 2,956
Income Tax Expense (Benefit) |  |  | 5,434 | 5,201 | 5,202
Capital additions |  |  | $ 1,130 | 4,675 | $ 9,088
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |  |
Bear Valley Electric Service, Inc. | Electric: |  |  |  |  |
Details of reportable segment |  |  |  |  |
Operating revenues | $ 18,377 |  | $ 38,345 |  |
Operating Income |  |  | 10,738 |  |
Interest expense, net |  |  | (141) |  |
Net utility plant |  |  | 106,508 |  |
Depreciation and amortization expense |  |  | 2,572 |  |
Income Tax Expense (Benefit) |  |  |  | $ 2,975 |
Capital additions |  |  | $ 19,859 |  |

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