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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Components of Net Periodic Benefits Cost: |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (3,493) | $ (2,976) |
GOLDEN STATE WATER COMPANY |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | (3,165) | (2,976) |
Pension Benefits |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Service cost | 1,625 | 1,408 |
Interest cost | 1,712 | 1,954 |
Expected return on plan assets | (3,134) | (2,950) |
Amortization of prior service cost | 109 | 109 |
Amortization of actuarial (gain) loss | 993 | 442 |
Net periodic benefits costs under accounting standards | 1,305 | 963 |
Increase (Decrease) in Regulatory Assets and Liabilities | (351) | (93) |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 954 | 870 |
Expected contributions in current fiscal year | $ 3,600 |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  | 2.55%
'Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Increase (Decrease) | 0.65% |  |
Defined Benefit Plan, Benefit Obligation |  |  | $ 272,800
Pension Benefits | Pro Forma |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 65 Basis Point Increase In Discount Rate, Percent |  |  | (10.00%)
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 65 Basis Point Increase In Discount Rate, Amount |  |  | $ (27,300)
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Regulatory adjustment — deferred | $ (665) |  |
Pension Benefits | Bear Valley Electric Service, Inc. |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Regulatory adjustment — deferred | (256) |  |
Other Postretirement Benefits |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Service cost | 40 | 47 |
Interest cost | 31 | 56 |
Expected return on plan assets | (134) | (127) |
Amortization of prior service cost | 0 | 0 |
Amortization of actuarial (gain) loss | (287) | (199) |
Net periodic benefits costs under accounting standards | (350) | (223) |
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | (350) | (223) |
SERP |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Service cost | 348 | 244 |
Interest cost | 229 | 247 |
Expected return on plan assets | 0 | 0 |
Amortization of prior service cost | 0 | 0 |
Amortization of actuarial (gain) loss | 419 | 211 |
Net periodic benefits costs under accounting standards | 996 | 702 |
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 996 | $ 702 |
Water Service Utility Operations [Member] | Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (351) |  |

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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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