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Business Segments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Details of reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  | $ 111,005 | $ 124,182 | $ 106,901 | $ 94,728 | $ 104,180 | $ 124,418 | $ 113,195 | $ 98,810 | $ 436,816 | $ 440,603 | $ 436,087
Operating income (loss) |  |  | 22,749 | 33,975 | 25,568 | 18,691 | 21,959 | 38,534 | 42,026 | 24,576 | 100,983 | 127,095 | 114,192
Interest expense, net |  |  |  |  |  |  |  |  |  |  | (19,855) | (20,792) | (21,235)
Net utility plant |  |  | 1,296,310 |  |  |  | 1,204,992 |  |  |  | 1,296,310 | 1,204,992 | 1,150,926
Depreciation and amortization expense | [1] |  |  |  |  |  |  |  |  |  | 40,425 | 39,031 | 38,850
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  |  | 18,017 | 38,974 | 34,735
Capital additions |  |  |  |  |  |  |  |  |  |  | $ 126,561 | 113,126 | 129,867
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  | 3 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 7 | (96) | (19)
Interest expense, net |  |  |  |  |  |  |  |  |  |  | (451) | (248) | (134)
Net utility plant |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Depreciation and amortization expense | [1] |  |  |  |  |  |  |  |  |  |  | 0 | 0
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  |  |  | (2,221) | (546)
Capital additions |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 | 0
GSWC |  |  |  |  |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  | 2 |  |
Operating revenues |  |  | 75,226 | 95,564 | 84,574 | 74,244 | 75,136 | 99,913 | 88,346 | 76,906 | $ 329,608 | 340,301 | 338,702
Operating income (loss) |  |  | 14,080 | $ 27,540 | $ 22,645 | $ 16,297 | 15,780 | $ 32,986 | $ 35,229 | $ 21,876 | 80,562 | 105,871 | 95,187
Net utility plant |  |  | 1,281,092 |  |  |  | 1,197,940 |  |  |  | 1,281,092 | 1,197,940 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  | 38,395 | 37,852 | 37,804
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  |  | 13,603 | 34,059 | 28,609
GSWC | Water Service Utility Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 295,258 | 306,332 | 302,931
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 74,342 | 98,678 | 87,331
Interest expense, net |  |  |  |  |  |  |  |  |  |  | (18,403) | (18,909) | (19,696)
Net utility plant |  |  | 1,218,468 |  |  |  | 1,137,995 |  |  |  | 1,218,468 | 1,137,995 | 1,089,031
Depreciation and amortization expense | [1] |  |  |  |  |  |  |  |  |  | 36,137 | 35,706 | 35,777
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  |  | 12,391 | 32,212 | 25,894
Capital additions |  |  |  |  |  |  |  |  |  |  | 110,934 | 104,546 | 120,850
GSWC | Electric Service Utility Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 34,350 | 33,969 | 35,771
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 6,220 | 7,193 | 7,856
Interest expense, net |  |  |  |  |  |  |  |  |  |  | (1,328) | (1,380) | (1,337)
Net utility plant |  |  | 62,624 |  |  |  | 59,945 |  |  |  | 62,624 | 59,945 | 56,280
Depreciation and amortization expense | [1] |  |  |  |  |  |  |  |  |  | 2,258 | 2,146 | 2,027
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  |  | 1,212 | 1,847 | 2,715
Capital additions |  |  |  |  |  |  |  |  |  |  | 5,420 | 5,941 | 7,063
American States Utility Services [Member] | Contracted Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 107,208 | 100,302 | 97,385
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 20,414 | 21,320 | 19,024
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 327 | (255) | (68)
Net utility plant |  |  | $ 15,218 |  |  |  | $ 7,052 |  |  |  | 15,218 | 7,052 | 5,615
Depreciation and amortization expense | [1] |  |  |  |  |  |  |  |  |  | 2,030 | 1,179 | 1,046
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  |  | 4,939 | 7,136 | 6,672
Capital additions |  |  |  |  |  |  |  |  |  |  | $ 10,207 | $ 2,639 | $ 1,954
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  | 50 years |  |  |  |  |  |  |  |  | 50 years |  |
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