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Revenue from Contract with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 117,060 | $ 109,077
GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 75,029 | 82,392
Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 75,339 | 70,483
Total operating revenues | 75,029 | 71,424
Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax |  | 10,290
Total operating revenues |  | 10,968
Electric Service Utility Operations | Bear Valley Electric Service, Inc. |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 11,879 |
Total operating revenues | 11,539 |
Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 30,492 | 26,685
Tariff-based Revenues | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 74,288 | 69,254
Tariff-based Revenues | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax |  | 10,032
Tariff-based Revenues | Electric Service Utility Operations | Bear Valley Electric Service, Inc. |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 11,677 |
Surcharges (Cost-recovery Activities) | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 534 | 734
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax |  | 258
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | Bear Valley Electric Service, Inc. |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 202 |
Other Products and Services | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 517 | 495
Alternative revenues program [Member] | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue program | (310) | (941)
Alternative revenues program [Member] | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue program |  | (678)
Alternative revenues program [Member] | Electric Service Utility Operations | Bear Valley Electric Service, Inc. |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue program | (340) |
Water | Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 18,883 | 14,701
Wastewater | Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | $ 11,609 | $ 11,984

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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