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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Pension Benefits |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | $ 1,401 | $ 1,251
Interest cost | 1,921 | 1,967
Expected return on plan assets | (2,791) | (2,610)
Amortization of prior service cost (benefit) | 0 | 0
Amortization of actuarial (gain) loss | 345 | 209
Net periodic pension cost under accounting standards | 876 | 817
Regulatory adjustment — deferred | 0 | 433
Total expense recognized, before surcharges and allocation to overhead pool | 876 | 1,250
Expected contributions in current fiscal year | 6,100 |
Pension Benefits | GOLDEN STATE WATER COMPANY |  |
Components of Net Periodic Benefits Cost: |  |
Regulatory adjustment — deferred | (2,100) |
Other Postretirement Benefits |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 57 | 59
Interest cost | 72 | 85
Expected return on plan assets | (123) | (122)
Amortization of prior service cost (benefit) | 0 | 0
Amortization of actuarial (gain) loss | (182) | (170)
Net periodic pension cost under accounting standards | (176) | (148)
Regulatory adjustment — deferred | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool | (176) | (148)
SERP |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 274 | 232
Interest cost | 222 | 223
Expected return on plan assets | 0 | 0
Amortization of prior service cost (benefit) | 0 | 3
Amortization of actuarial (gain) loss | 262 | 194
Net periodic pension cost under accounting standards | 758 | 652
Regulatory adjustment — deferred | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool | $ 758 | $ 652

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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