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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | $ (367) | $ (19,112)
GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | 582 | (19,112)
Pension Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | $ 1,390 | $ 1,110 | 4,170 | 3,330
Interest cost | 1,970 | 2,132 | 5,910 | 6,396
Expected return on plan assets | (2,950) | (2,594) | (8,850) | (7,782)
Amortization of prior service cost | 109 | 109 | 327 | 327
Amortization of actuarial (gain) loss | 484 | 355 | 1,452 | 1,065
Net periodic benefits costs under accounting standards | 1,003 | 1,112 | 3,009 | 3,336
Increase (Decrease) in Regulatory Assets and Liabilities | (121) | (160) | (362) | (502)
Expected contributions in current fiscal year | 3,700 |  | 3,700 |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 882 | 952 | 2,647 | 2,834
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  |  | (502)
Regulatory adjustment — deferred | (1,100) |  | (1,100) |
Pension Benefits | Bear Valley Electric Service, Inc. |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Regulatory adjustment — deferred | (166) |  | (166) |
Other Postretirement Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 35 | 53 | 129 | 159
Interest cost | 44 | 80 | 156 | 240
Expected return on plan assets | (130) | (112) | (384) | (336)
Amortization of prior service cost | 0 | 0 |  |
Amortization of actuarial (gain) loss | (334) | (150) | (732) | (450)
Net periodic benefits costs under accounting standards | (385) | (129) | (831) | (387)
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | (385) | (129) | (831) | (387)
SERP |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 244 | 298 | 732 | 894
Interest cost | 247 | 267 | 741 | 801
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | 211 | 118 | 633 | 354
Net periodic benefits costs under accounting standards | 702 | 683 | 2,106 | 2,049
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 702 | $ 683 | $ 2,106 | $ 2,049
Water Service Utility Operations [Member] | Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (121) |  |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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