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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Schedule of reporting segments information | Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS and property installed by developers and conveyed to GSWC.
|  | As Of And For The Year Ended December 31, 2018
|  | GSWC |  | ASUS |  | AWR |  | Consolidated
(dollars in thousands) |  | Water |  | Electric |  | Contracts |  | Parent |  | AWR
Operating revenues |  | $ | 295,258 |  |  | $ | 34,350 |  |  | $ | 107,208 |  |  | $ | — |  |  | $ | 436,816 |
Operating income |  | 74,342 |  |  | 6,220 |  |  | 20,414 |  |  | 7 |  |  | 100,983 |
Interest expense, net |  | 18,403 |  |  | 1,328 |  |  | (327 | ) |  | 451 |  |  | 19,855 |
Utility Plant |  | 1,218,468 |  |  | 62,624 |  |  | 15,218 |  |  | — |  |  | 1,296,310 |
Depreciation and amortization expense (1) |  | 36,137 |  |  | 2,258 |  |  | 2,030 |  |  |  |  |  | 40,425 |
Income tax expense/(benefit) |  | 12,391 |  |  | 1,212 |  |  | 4,939 |  |  | (525 | ) |  | 18,017 |
Capital additions |  | 110,934 |  |  | 5,420 |  |  | 10,207 |  |  | — |  |  | 126,561 |
|  | As Of And For The Year Ended December 31, 2017
|  | GSWC |  | ASUS |  | AWR |  | Consolidated
(dollars in thousands) |  | Water |  | Electric |  | Contracts |  | Parent |  | AWR
Operating revenues |  | $ | 306,332 |  |  | $ | 33,969 |  |  | $ | 100,302 |  |  | $ | — |  |  | $ | 440,603 |
Operating income (loss) (2) |  | 98,678 |  |  | 7,193 |  |  | 21,320 |  |  | (96 | ) |  | 127,095 |
Interest expense, net |  | 18,909 |  |  | 1,380 |  |  | 255 |  |  | 248 |  |  | 20,792 |
Utility Plant |  | 1,137,995 |  |  | 59,945 |  |  | 7,052 |  |  | — |  |  | 1,204,992 |
Depreciation and amortization expense (1) |  | 35,706 |  |  | 2,146 |  |  | 1,179 |  |  | — |  |  | 39,031 |
Income tax expense/(benefit) |  | 32,212 |  |  | 1,847 |  |  | 7,136 |  |  | (2,221 | ) |  | 38,974 |
Capital additions |  | 104,546 |  |  | 5,941 |  |  | 2,639 |  |  | — |  |  | 113,126 |
|  | As Of And For The Year Ended December 31, 2016
|  | GSWC |  | ASUS |  | AWR |  | Consolidated
(dollars in thousands) |  | Water |  | Electric |  | Contracts |  | Parent |  | AWR
Operating revenues |  | $ | 302,931 |  |  | $ | 35,771 |  |  | $ | 97,385 |  |  | $ | — |  |  | $ | 436,087 |
Operating income (loss) (2) |  | 87,331 |  |  | 7,856 |  |  | 19,024 |  |  | (19 | ) |  | 114,192 |
Interest expense, net |  | 19,696 |  |  | 1,337 |  |  | 68 |  |  | 134 |  |  | 21,235 |
Utility Plant |  | 1,089,031 |  |  | 56,280 |  |  | 5,615 |  |  | — |  |  | 1,150,926 |
Depreciation and amortization expense (1) |  | 35,777 |  |  | 2,027 |  |  | 1,046 |  |  | — |  |  | 38,850 |
Income tax expense/(benefit) |  | 25,894 |  |  | 2,715 |  |  | 6,672 |  |  | (546 | ) |  | 34,735 |
Capital additions |  | 120,850 |  |  | 7,063 |  |  | 1,954 |  |  | — |  |  | 129,867 |
Schedule of reconciliation of total utility plant (a key figure for rate-making) to total consolidated assets | The following table reconciles total utility plant (a key figure for rate-making) to total consolidated assets (in thousands):
|  | December 31,
|  | 2018 |  | 2017
Total utility plant |  | $ | 1,296,310 |  |  | $ | 1,204,992 |
Other assets |  | 205,123 |  |  | 211,742 |
Total consolidated assets |  | $ | 1,501,433 |  |  | $ | 1,416,734 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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