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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | $ (13,932) | $ 12,240
GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | (13,932) | 12,240
Pension Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | $ 986 | $ 1,269 | 2,220 | 2,670
Interest cost | 2,133 | 1,903 | 4,264 | 3,824
Expected return on plan assets | (2,595) | (2,795) | (5,188) | (5,586)
Amortization of prior service cost | 109 | 0 | 218 | 0
Amortization of actuarial (gain) loss | 351 | 283 | 710 | 628
Net periodic benefits costs under accounting standards | 984 | 660 | 2,224 | 1,536
Increase (Decrease) in Regulatory Assets and Liabilities | (342) | 0 | (342) | 0
Expected contributions in current fiscal year | 3,900 |  | 3,900 |
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | 642 | 660 | 1,882 | 1,536
Pension Benefits | GOLDEN STATE WATER COMPANY |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Regulatory adjustment — deferred |  |  | (2,900) |
Other Postretirement Benefits |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 53 | 57 | 106 | 114
Interest cost | 80 | 72 | 160 | 144
Expected return on plan assets | (112) | (123) | (224) | (246)
Amortization of prior service cost | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | (150) | (182) | (300) | (364)
Net periodic benefits costs under accounting standards | (129) | (176) | (258) | (352)
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | (129) | (176) | (258) | (352)
SERP |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |
Service cost | 298 | 274 | 596 | 548
Interest cost | 267 | 222 | 534 | 444
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost | 0 | 0 | 0 | 0
Amortization of actuarial (gain) loss | 118 | 262 | 236 | 524
Net periodic benefits costs under accounting standards | 683 | 758 | 1,366 | 1,516
Increase (Decrease) in Regulatory Assets and Liabilities | 0 | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool | $ 683 | $ 758 | $ 1,366 | $ 1,516

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- Definition The total amount of net periodic benefit cost for defined benefit plans during the period, before allocation to overhead pool. + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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