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Employee Benefit Plans: (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Pension Benefits |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | $ 1,249 | $ 1,316 | $ 2,500 | $ 2,548
Interest cost |  | 1,985 | 2,026 | 3,952 | 3,956
Expected return on plan assets |  | (2,240) | (2,460) | (4,850) | (4,920)
Amortization of prior service cost (benefit) |  | 0 | 12 | 0 | 24
Amortization of actuarial (gain) loss |  | 253 | 329 | 462 | 456
Net periodic pension cost under accounting standards |  | 1,247 | 1,223 | 2,064 | 2,064
Regulatory adjustment — deferred |  | 92 | 64 | 525 | 423
Total expense recognized, before surcharges and allocation to overhead pool |  | 1,339 | 1,287 | 2,589 | 2,487
Expected contributions in current fiscal year | $ 6,500 | 6,500 |  | 6,500 |
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Regulatory adjustment — deferred | $ 259 |  |  |  |
Other Postretirement Benefits |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | 59 | 68 | 118 | 136
Interest cost |  | 85 | 97 | 170 | 194
Expected return on plan assets |  | (122) | (122) | (244) | (244)
Amortization of prior service cost (benefit) |  | 0 | (9) | 0 | (18)
Amortization of actuarial (gain) loss |  | (170) | (150) | (340) | (300)
Net periodic pension cost under accounting standards |  | (148) | (116) | (296) | (232)
Regulatory adjustment — deferred |  | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool |  | (148) | (116) | (296) | (232)
SERP |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | 232 | 200 | 464 | 400
Interest cost |  | 223 | 186 | 446 | 372
Expected return on plan assets |  | 0 | 0 | 0 | 0
Amortization of prior service cost (benefit) |  | 3 | 6 | 6 | 12
Amortization of actuarial (gain) loss |  | 194 | 73 | 388 | 146
Net periodic pension cost under accounting standards |  | 652 | 465 | 1,304 | 930
Regulatory adjustment — deferred |  | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool |  | $ 652 | $ 465 | $ 1,304 | $ 930

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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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