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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Components of Net Periodic Benefits Cost: |  |  |  |
Contributions by employer |  |  | $ 6,000 |
Pension Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | $ 1,335 | $ 1,250 | 4,005 | $ 3,750
Interest cost | 1,912 | 1,976 | 5,736 | 5,928
Expected return on plan assets | (2,793) | (2,428) | (8,379) | (7,278)
Amortization of prior service cost (benefit) | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | 314 | 231 | 942 | 693
Net periodic pension cost under accounting standards | 768 | 1,029 | 2,304 | 3,093
Regulatory adjustment — deferred | 0 | (266) | 0 | (791)
Total expense recognized, before surcharges and allocation to overhead pool | 768 | 1,295 | 2,304 | 3,884
Pension Benefits | Golden State Water Company |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Regulatory adjustment — deferred |  |  | 2,500 |
Other Postretirement Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 48 | 53 | 162 | 171
Interest cost | 75 | 73 | 219 | 243
Expected return on plan assets | (123) | (107) | (369) | (351)
Amortization of prior service cost (benefit) | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | (212) | (242) | (576) | (582)
Net periodic pension cost under accounting standards | (212) | (223) | (564) | (519)
Regulatory adjustment — deferred | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool | (212) | (223) | (564) | (519)
SERP |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 274 | 232 | 822 | 696
Interest cost | 222 | 223 | 666 | 669
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost (benefit) | 0 | 3 | 0 | 9
Amortization of actuarial (gain) loss | 262 | 194 | 786 | 582
Net periodic pension cost under accounting standards | 758 | 652 | 2,274 | 1,956
Regulatory adjustment — deferred | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool | $ 758 | $ 652 | $ 2,274 | $ 1,956

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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 contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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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