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Employee Benefit Plans: (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Pension Benefits |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | $ 1,250 | $ 1,274 | $ 3,750 | $ 3,822
Interest cost |  | 1,976 | 1,978 | 5,928 | 5,934
Expected return on plan assets |  | (2,428) | (2,457) | (7,278) | (7,377)
Amortization of prior service cost (benefit) |  | 0 | 12 | 0 | 36
Amortization of actuarial (gain) loss |  | 231 | 228 | 693 | 684
Net periodic pension cost under accounting standards |  | 1,029 | 1,035 | 3,093 | 3,099
Regulatory adjustment — deferred |  | 266 | 221 | 791 | 644
Total expense recognized, before surcharges and allocation to overhead pool |  | 1,295 | 1,256 | 3,884 | 3,743
Expected contributions in current fiscal year |  | 6,500 |  | 6,500 |
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Regulatory adjustment — deferred | $ (1,100) |  |  |  |
Other Postretirement Benefits |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | 53 | 68 | 171 | 204
Interest cost |  | 73 | 97 | 243 | 291
Expected return on plan assets |  | (107) | (122) | (351) | (366)
Amortization of prior service cost (benefit) |  | 0 | (9) | 0 | (27)
Amortization of actuarial (gain) loss |  | (242) | (150) | (582) | (450)
Net periodic pension cost under accounting standards |  | (223) | (116) | (519) | (348)
Regulatory adjustment — deferred |  | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool |  | (223) | (116) | (519) | (348)
SERP |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | 232 | 200 | 696 | 600
Interest cost |  | 223 | 186 | 669 | 558
Expected return on plan assets |  | 0 | 0 | 0 | 0
Amortization of prior service cost (benefit) |  | 3 | 6 | 9 | 18
Amortization of actuarial (gain) loss |  | 194 | 73 | 582 | 219
Net periodic pension cost under accounting standards |  | 652 | 465 | 1,956 | 1,395
Regulatory adjustment — deferred |  | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool |  | $ 652 | $ 465 | $ 1,956 | $ 1,395

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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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