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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Components of Net Periodic Benefits Cost: |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (5,713) | $ (3,493) |
GSWC |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | (5,135) | (3,165) |
Pension Plan [Member] |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Defined Benefit Plan, Service Cost | 1,480 | 1,625 |
Defined Benefit Plan, Interest Cost | 1,844 | 1,712 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 3,292 | 3,134 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 109 | 109 |
Defined Benefit Plan, Amortization of Gain (Loss) | 0 | (993) |
Net periodic benefits costs under accounting standards | 141 | 1,305 |
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | (351) |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | $ 141 | 954 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  | 2.89%
'Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Increase (Decrease) | 0.89% |  |
Defined Benefit Plan, Benefit Obligation | $ 259,800 |  |
Expected contributions in current fiscal year | $ 3,100 |  |
Pension Plan [Member] | Pro Forma |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 89 Basis Point Increase In Discount Rate, Percent | 12.00% |  |
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 89 Basis Point Increase In Discount Rate, Amount | $ 30,400 |  |
Pension Plan [Member] | GSWC |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Regulatory adjustment — deferred | (134) |  |
Pension Plan [Member] | BVESI |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Regulatory adjustment — deferred | (372) |  |
Other Postretirement Benefits Plan [Member] |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Defined Benefit Plan, Service Cost | 33 | 40 |
Defined Benefit Plan, Interest Cost | 16 | 31 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 147 | 134 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0 | 0 |
Defined Benefit Plan, Amortization of Gain (Loss) | 412 | 287 |
Net periodic benefits costs under accounting standards | (510) | (350) |
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | (510) | (350) |
Supplemental Employee Retirement Plan [Member] |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Defined Benefit Plan, Service Cost | 298 | 348 |
Defined Benefit Plan, Interest Cost | 256 | 229 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 0 | 0 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0 | 0 |
Defined Benefit Plan, Amortization of Gain (Loss) | (145) | (419) |
Net periodic benefits costs under accounting standards | 699 | 996 |
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | $ 699 | 996 |
Water Service Utility Operations [Member] | Pension Plan [Member] | GSWC |  |  |
Components of Net Periodic Benefits Cost: |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  | $ (351) |

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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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