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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pension Benefits |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | $ 1,269 | $ 1,249 | $ 2,670 | $ 2,500
Interest cost |  | 1,903 | 1,985 | 3,824 | 3,952
Expected return on plan assets |  | (2,795) | (2,240) | (5,586) | (4,850)
Amortization of prior service cost (benefit) |  | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss |  | 283 | 253 | 628 | 462
Net periodic pension cost under accounting standards |  | 660 | 1,247 | 1,536 | 2,064
Regulatory adjustment — deferred |  | 0 | (92) | 0 | (525)
Total expense recognized, before surcharges and allocation to overhead pool |  | 660 | 1,339 | 1,536 | 2,589
Expected contributions in current fiscal year |  | 6,100 |  | 6,100 |
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Regulatory adjustment — deferred |  |  |  | 2,200 |
Other Postretirement Benefits |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | 57 | 59 | 114 | 118
Interest cost |  | 72 | 85 | 144 | 170
Expected return on plan assets |  | (123) | (122) | (246) | (244)
Amortization of prior service cost (benefit) |  | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss |  | (182) | (170) | (364) | (340)
Net periodic pension cost under accounting standards |  | (176) | (148) | (352) | (296)
Regulatory adjustment — deferred |  | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool |  | (176) | (148) | (352) | (296)
SERP |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |
Service cost |  | 274 | 232 | 548 | 464
Interest cost |  | 222 | 223 | 444 | 446
Expected return on plan assets |  | 0 | 0 | 0 | 0
Amortization of prior service cost (benefit) |  | 0 | 3 | 0 | 6
Amortization of actuarial (gain) loss |  | 262 | 194 | 524 | 388
Net periodic pension cost under accounting standards |  | 758 | 652 | 1,516 | 1,304
Regulatory adjustment — deferred |  | 0 | 0 | 0 | 0
Total expense recognized, before surcharges and allocation to overhead pool |  | $ 758 | $ 652 | $ 1,516 | $ 1,304
Subsequent Event [Member] |  |  |  |  |
Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 1,000 |  |  |  |

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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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