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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Pension Benefits |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | $ 1,234 | $ 1,401
Interest cost | 2,131 | 1,921
Expected return on plan assets | (2,593) | (2,791)
Amortization of prior service cost (benefit) | 109 | 0
Amortization of actuarial (gain) loss | 359 | 345
Total expense recognized, before surcharges and allocation to overhead pool | 1,240 | 876
Expected contributions in current fiscal year | 3,600 |
Pension Benefits | GOLDEN STATE WATER COMPANY |  |
Components of Net Periodic Benefits Cost: |  |
Regulatory adjustment — deferred | (3,100) |
Other Postretirement Benefits |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 53 | 57
Interest cost | 80 | 72
Expected return on plan assets | (112) | (123)
Amortization of prior service cost (benefit) | 0 | 0
Amortization of actuarial (gain) loss | (150) | (182)
Total expense recognized, before surcharges and allocation to overhead pool | (129) | (176)
SERP |  |
Components of Net Periodic Benefits Cost: |  |
Service cost | 298 | 274
Interest cost | 267 | 222
Expected return on plan assets | 0 | 0
Amortization of prior service cost (benefit) | 0 | 0
Amortization of actuarial (gain) loss | 118 | 262
Total expense recognized, before surcharges and allocation to overhead pool | $ 683 | $ 758

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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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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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