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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | $ (8,319) | $ (367)
GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | (7,316) | 582
Pension Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | $ 1,487 | $ 1,390 | 4,737 | 4,170
Interest cost | 1,700 | 1,970 | 5,124 | 5,910
Expected return on plan assets | (3,137) | (2,950) | (9,405) | (8,850)
Amortization of prior service cost | 109 | 109 | 327 | 327
Amortization of actuarial (gain) loss | 876 | 484 | 2,862 | 1,452
Net periodic benefits costs under accounting standards | 1,035 | 1,003 | 3,645 | 3,009
Increase (Decrease) in Regulatory Assets and Liabilities | (254) | (121) | (956) | (362)
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 781 | 882 | 2,689 | 2,647
Expected contributions in current fiscal year | 3,500 |  | 3,500 |
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Regulatory adjustment — deferred | (60) |  | (60) |
Pension Benefits | Bear Valley Electric Service, Inc. |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Regulatory adjustment — deferred | (184) |  | (184) |
Other Postretirement Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 31 | 35 | 111 | 129
Interest cost | 22 | 44 | 84 | 156
Expected return on plan assets | (134) | (130) | (402) | (384)
Amortization of prior service cost | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | (488) | (334) | (1,062) | (732)
Net periodic benefits costs under accounting standards | (569) | (385) | (1,269) | (831)
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | (569) | (385) | (1,269) | (831)
SERP |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 348 | 244 | 1,044 | 732
Interest cost | 229 | 247 | 687 | 741
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | 419 | 211 | 1,257 | 633
Net periodic benefits costs under accounting standards | 996 | 702 | 2,988 | 2,106
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 996 | 702 | 2,988 | 2,106
Water Service Utility Operations [Member] | Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (254) | $ (121) | $ (956) | $ (362)

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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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