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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Employee benefit plans |
Schedule of Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability | The following table sets forth the Pension Plan’s and post-retirement medical plan’s funded status and amounts recognized in Registrant’s balance sheets and the components of net pension cost and accrued liability at December 31, 2017 and 2016:
|  | Pension Benefits |  | Post-Retirement Medical Benefits
(dollars in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Change in Projected Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 180,364 |  |  | $ | 168,934 |  |  | $ | 8,802 |  |  | $ | 9,393 |
Service cost |  | 4,999 |  |  | 5,094 |  |  | 227 |  |  | 247 |
Interest cost |  | 7,904 |  |  | 7,910 |  |  | 324 |  |  | 371 |
Actuarial (gain) loss |  | 20,397 |  |  | 4,162 |  |  | (355 | ) |  | (715 | )
Benefits/expenses paid |  | (5,974 | ) |  | (5,736 | ) |  | (507 | ) |  | (494 | )
Projected benefit obligation at end of year |  | $ | 207,690 |  |  | $ | 180,364 |  |  | $ | 8,491 |  |  | $ | 8,802 |
Changes in Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 150,872 |  |  | $ | 142,174 |  |  | $ | 10,538 |  |  | $ | 10,614 |
Actual return on plan assets |  | 22,246 |  |  | 9,182 |  |  | 1,022 |  |  | 418 |
Employer contributions |  | 6,504 |  |  | 5,252 |  |  | — |  |  | — |
Benefits/expenses paid |  | (5,974 | ) |  | (5,736 | ) |  | (507 | ) |  | (494 | )
Fair value of plan assets at end of year |  | $ | 173,648 |  |  | $ | 150,872 |  |  | $ | 11,053 |  |  | $ | 10,538 |
Funded Status: |  |  |  |  |  |  |  |  |  |  |  |
Net amount recognized as accrued pension cost |  | $ | (34,042 | ) |  | $ | (29,492 | ) |  | $ | 2,562 |  |  | $ | 1,736 |
|  | Pension Benefits |  | Post-Retirement Medical Benefits
(dollars in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Amounts recognized on the balance sheets: |  |  |  |  |  |  |  |  |  |  |  |
Non-current assets |  | $ | — |  |  | $ | — |  |  | $ | 2,562 |  |  | $ | 1,736 |
Current liabilities |  | — |  |  | — |  |  | — |  |  | — |
Non-current liabilities |  | (34,042 | ) |  | (29,492 | ) |  | — |  |  | — |
Net amount recognized |  | $ | (34,042 | ) |  | $ | (29,492 | ) |  | $ | 2,562 |  |  | $ | 1,736 |
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Net (gain) loss |  | 32,761 |  |  | 25,828 |  |  | (5,650 | ) |  | (5,515 | )
Regulatory assets (liabilities) |  | 32,761 |  |  | 25,828 |  |  | (5,650 | ) |  | (5,515 | )
Unfunded accrued pension cost |  | 1,281 |  |  | 3,664 |  |  | 3,088 |  |  | 3,779 |
Net liability (asset) recognized |  | $ | 34,042 |  |  | $ | 29,492 |  |  | $ | (2,562 | ) |  | $ | (1,736 | )
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset at beginning of year |  | $ | 25,828 |  |  | $ | 21,970 |  |  | $ | (5,515 | ) |  | $ | (5,606 | )
Net loss (gain) |  | 7,856 |  |  | 4,818 |  |  | (910 | ) |  | (644 | )
Amortization of prior service (cost) credit |  | — |  |  | (49 | ) |  | — |  |  | 34 |
Amortization of net gain (loss) |  | (923 | ) |  | (911 | ) |  | 775 |  |  | 701 |
Total change in regulatory asset |  | 6,933 |  |  | 3,858 |  |  | (135 | ) |  | 91 |
Regulatory asset (liability) at end of year |  | $ | 32,761 |  |  | $ | 25,828 |  |  | $ | (5,650 | ) |  | $ | (5,515 | )
Net periodic pension costs |  | $ | 4,121 |  |  | $ | 4,126 |  |  | $ | (690 | ) |  | $ | (606 | )
Change in regulatory asset |  | 6,933 |  |  | 3,858 |  |  | (135 | ) |  | 91 |
Total recognized in net periodic pension cost and regulatory asset (liability) |  | $ | 11,054 |  |  | $ | 7,984 |  |  | $ | (825 | ) |  | $ | (515 | )
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |  |  |  |  |  |  |
Prior service (cost) credit |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Net gain (loss) |  | $ | (1,378 | ) |  | $ | (835 | ) |  | $ | 727 |  |  | $ | 679 |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation |  | $ | 207,690 |  |  | $ | 180,364 |  |  | $ | 8,491 |  |  | $ | 8,802 |
Accumulated benefit obligation |  | $ | 190,438 |  |  | $ | 165,998 |  |  | N/A |  | N/A
Fair value of plan assets |  | $ | 173,648 |  |  | $ | 150,872 |  |  | $ | 11,053 |  |  | $ | 10,538 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.76 | % |  | 4.44 | % |  | 3.52 | % |  | 3.97 | %
Rate of compensation increase |  | * |  |  | * |  |  | N/A |  |  | N/A |
* Age-graded ranging from 3.0% to 8.0%.
Schedule of components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool | The components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool, for 2017, 2016 and 2015 are as follows:
|  | Pension Benefits |  | Post-Retirement Medical Benefits
(dollars in thousands, except percent) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 4,999 |  |  | $ | 5,094 |  |  | $ | 6,276 |  |  | $ | 227 |  |  | $ | 247 |  |  | $ | 340 |
Interest cost |  | 7,904 |  |  | 7,910 |  |  | 7,686 |  |  | 324 |  |  | 371 |  |  | 435 |
Expected return on plan assets |  | (9,705 | ) |  | (9,838 | ) |  | (9,795 | ) |  | (466 | ) |  | (489 | ) |  | (493 | )
Amortization of prior service cost (credit) |  | — |  |  | 49 |  |  | 118 |  |  | — |  |  | (34 | ) |  | (200 | )
Amortization of actuarial (gain) loss |  | 923 |  |  | 911 |  |  | 1,790 |  |  | (775 | ) |  | (701 | ) |  | (316 | )
Net periodic pension cost under accounting standards |  | $ | 4,121 |  |  | $ | 4,126 |  |  | $ | 6,075 |  |  | $ | (690 | ) |  | $ | (606 | ) |  | $ | (234 | )
Regulatory adjustment |  | 465 |  |  | 859 |  |  | 523 |  |  | — |  |  | — |  |  | — |
Total expense recognized, before surcharges and allocation to overhead pool |  | $ | 4,586 |  |  | $ | 4,985 |  |  | $ | 6,598 |  |  | $ | (690 | ) |  | $ | (606 | ) |  | $ | (234 | )
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.44 | % |  | 4.65 | % |  | 4.25 | % |  | 3.97 | % |  | 4.25 | % |  | 3.80 | %
Expected long-term return on plan assets |  | 6.50 | % |  | 7.00 | % |  | 7.00 | % |  | * |  |  | * |  |  | * |
Rate of compensation increase |  | ** |  |  | ** |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | N/A |
*6.0% for union plan and 4.2% for non-union (net of income taxes) in 2017, and 7.00% for union plan and 4.20% for non-union (net of income taxes) for 2016 and 2015.
Schedule of Actual Allocation of Plan Assets [Table Text Block] | The Committee approves the target asset allocations. Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2017 and 2016, by asset category are as follows:
|  | Pension Benefits |  | Post-Retirement Medical Benefits
Asset Category |  | 2017 |  | 2016 |  | 2017 |  | 2016
Actual Asset Allocations: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | 57 | % |  | 57 | % |  | 59 | % |  | 58 | %
Debt securities |  | 39 | % |  | 38 | % |  | 37 | % |  | 39 | %
Real Estate Funds |  | 4 | % |  | 5 | % |  | — | % |  | — | %
Cash equivalents |  | — | % |  | — | % |  | 4 | % |  | 3 | %
Total |  | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
Schedule of pension and post-retirement plan target asset allocations | Equity securities did not include AWR’s Common Shares as of December 31, 2017 and 2016.
Target Asset Allocations for 2017: |  | Pension Benefits |  | Post-retirement Medical Benefits
Equity securities |  | 60 | % |  | 60 | %
Debt securities |  | 40 | % |  | 40 | %
Total |  | 100 | % |  | 100 | %
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] | The following tables set forth the fair value, measured by net asset value, of the pension investment assets as of December 31, 2017 and 2016:
|  | Net Asset Value as of December 31, 2017
(dollars in thousands) |  | Fair Value |  | Unfunded Commitments |  | Redemption Frequency |  | Redemption Notice Period
Cash equivalents |  | $ | 489 |  |  | — |  |  | N/A |  | N/A
Fixed income fund |  | 66,669 |  |  | — |  |  | Daily |  | Daily
Equity securities: |  |  |  |  |  |  |  |
U.S. small/mid cap funds |  | 26,998 |  |  | — |  |  | Daily |  | Daily
U.S. large cap funds |  | 53,985 |  |  | — |  |  | Daily |  | Daily
International funds |  | 17,893 |  |  | — |  |  | Daily |  | Daily
Total equity funds |  | 98,876 |  |  | — |  |  |  |  |
Real estate funds |  | 7,614 |  |  | — |  |  | Daily |  | Daily
Total |  | $ | 173,648 |  |  | — |  |  |  |  |
|  | Net Asset Value as of December 31, 2016
(dollars in thousands) |  | Fair Value |  | Unfunded Commitments |  | Redemption Frequency |  | Redemption Notice Period
Cash equivalents |  | $ | 500 |  |  | — |  |  | N/A |  | N/A
Fixed income fund |  | 57,674 |  |  | — |  |  | Daily |  | Daily
Equity securities: |  |  |  |  |  |  |  |
U.S. small/mid cap funds |  | 24,312 |  |  | — |  |  | Daily |  | Daily
U.S. large cap funds |  | 46,175 |  |  | — |  |  | Daily |  | Daily
International funds |  | 14,869 |  |  | — |  |  | Daily |  | Daily
Total equity funds |  | 85,356 |  |  |  |  |  |  |  |
Real estate funds |  | 7,342 |  |  | — |  |  | Daily |  | Daily
Total |  | $ | 150,872 |  |  | — |  |  |  |  |
Schedule of pension and post-retirement plans' investment assets measured at fair value | The following tables set forth by level, within the fair value hierarchy, the post-retirement plan's investment assets measured at fair value as of December 31, 2017 and 2016:
|  | Fair Value as of December 31, 2017
(dollars in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fair Value of Post-Retirement Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 189 |  |  | — |  |  | — |  |  | $ | 189 |
Fixed income |  | 4,364 |  |  | — |  |  | — |  |  | 4,364 |
U.S. equity securities (large cap stocks) |  | 6,507 |  |  | — |  |  | — |  |  | 6,507 |
Total investments measured at fair value |  | $ | 11,060 |  |  | — |  |  | — |  |  | $ | 11,060 |
|  | Fair Value as of December 31, 2016
(dollars in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fair Value of Post-Retirement Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 360 |  |  | — |  |  | — |  |  | $ | 360 |
Fixed income |  | 4,072 |  |  | — |  |  | — |  |  | 4,072 |
U.S. equity securities (large cap stocks) |  | 6,106 |  |  | — |  |  | — |  |  | 6,106 |
Total investments measured at fair value |  | $ | 10,538 |  |  | — |  |  | — |  |  | $ | 10,538 |
Schedule of estimated future benefit payments | stimated future benefit payments at December 31, 2017 for the next five years and thereafter are as follows (in thousands):
| Pension Benefits |  | Post-Retirement Medical Benefits
2018 | $ | 6,737 |  |  | $ | 554 |
2019 | 7,281 |  |  | 574 |
2020 | 7,900 |  |  | 632 |
2021 | 8,516 |  |  | 720 |
2022 | 9,196 |  |  | 749 |
Thereafter | 54,429 |  |  | 3,365 |
Total | $ | 94,059 |  |  | $ | 6,594 |
Schedule of effects of one-percentage-point change in assumed health care cost trend rates | A one-percentage-point change in assumed health care cost trend rates would have the following effects on the post-retirement medical plan:
(dollars in thousands) |  | 1-Percentage-Point Increase |  | 1-Percentage-Point Decrease
Effect on total of service and interest cost components |  | $ | 45 |  |  | $ | (39 | )
Effect on post-retirement benefit obligation |  | $ | 894 |  |  | $ | (769 | )
Supplemental Employee Retirement Plan [Member] |
Employee benefit plans |
Schedule of Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability | The following provides a reconciliation of benefit obligations, funded status of the SERP, as well as a summary of significant estimates at December 31, 2017 and 2016:
(dollars in thousands) |  | 2017 |  | 2016
Change in Benefit Obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 20,783 |  |  | $ | 16,317 |
Service cost |  | 930 |  |  | 799 |
Interest cost |  | 893 |  |  | 743 |
Actuarial (gain) loss |  | 1,872 |  |  | 3,341 |
Benefits paid |  | (416 | ) |  | (417 | )
Benefit obligation at end of year |  | $ | 24,062 |  |  | $ | 20,783 |
Changes in Plan Assets: |  |  |  |  |  |
Fair value of plan assets at beginning and end of year |  | — |  |  | — |
Funded Status: |  |  |  |  |  |
Net amount recognized as accrued cost |  | $ | (24,062 | ) |  | $ | (20,783 | )
(in thousands) |  | 2017 |  | 2016
Amounts recognized on the balance sheets: |  |  |  |  |  |
Current liabilities |  | $ | (409 | ) |  | $ | (419 | )
Non-current liabilities |  | (23,653 | ) |  | (20,364 | )
Net amount recognized |  | $ | (24,062 | ) |  | $ | (20,783 | )
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost |  | $ | — |  |  | $ | 11 |
Net loss |  | 7,556 |  |  | 6,463 |
Regulatory assets |  | 7,556 |  |  | 6,474 |
Unfunded accrued cost |  | 16,506 |  |  | 14,309 |
Net liability recognized |  | $ | 24,062 |  |  | $ | 20,783 |
Changes in plan assets and benefit obligations recognized in regulatory assets consist of: |  |  |  |  |  |
Regulatory asset at beginning of year |  | $ | 6,474 |  |  | $ | 3,452 |
Net (gain) loss |  | 1,872 |  |  | 3,339 |
Amortization of prior service credit |  | (12 | ) |  | (25 | )
Amortization of net loss |  | (778 | ) |  | (292 | )
Total change in regulatory asset |  | 1,082 |  |  | 3,022 |
Regulatory asset at end of year |  | $ | 7,556 |  |  | $ | 6,474 |
Net periodic pension cost |  | $ | 2,612 |  |  | $ | 1,859 |
Change in regulatory asset |  | 1,082 |  |  | 3,022 |
Total recognized in net periodic pension and regulatory asset |  | $ | 3,694 |  |  | $ | 4,881 |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net asset (obligation) |  | $ | — |  |  | $ | — |
Prior service cost |  | — |  |  | (11 | )
Net loss |  | (1,049 | ) |  | (777 | )
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  | $ | 24,062 |  |  | $ | 20,783 |
Accumulated benefit obligation |  | 20,742 |  |  | 17,144 |
Fair value of plan assets |  | — |  |  | — |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |  |  |
Discount rate |  | 3.72 | % |  | 4.34 | %
Rate of compensation increase |  | 4.00 | % |  | 4.00 | %
Schedule of components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool | The components of SERP expense, before allocation to the overhead pool, for 2017, 2016 and 2015 are as follows:
(dollars in thousands, except percent) |  | 2017 |  | 2016 |  | 2015
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |
Service cost |  | $ | 930 |  |  | $ | 799 |  |  | $ | 814 |
Interest cost |  | 893 |  |  | 743 |  |  | 653 |
Amortization of prior service cost |  | 12 |  |  | 25 |  |  | 117 |
Amortization of net loss |  | 777 |  |  | 292 |  |  | 431 |
Net periodic pension cost |  | $ | 2,612 |  |  | $ | 1,859 |  |  | $ | 2,015 |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |  |  |  |
Discount rate |  | 4.34 | % |  | 4.61 | % |  | 4.15 | %
Rate of compensation increase |  | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Schedule of pension and post-retirement plans' investment assets measured at fair value | The following tables set forth by level, within the fair value hierarchy, the Rabbi Trust investment assets measured at fair value as of December 31, 2017 and 2016:
|  | Fair Value as of December 31, 2017
(dollars in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fair Value of Assets held in Rabbi Trust: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 45 |  |  | — |  |  | — |  |  | $ | 45 |
Fixed income securities |  | 6,072 |  |  | — |  |  | — |  |  | 6,072 |
Equity securities |  | 9,110 |  |  | — |  |  | — |  |  | 9,110 |
Total investments measured at fair value |  | $ | 15,227 |  |  | — |  |  | — |  |  | $ | 15,227 |
|  | Fair Value as of December 31, 2016
(dollars in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fair Value of Assets held in Rabbi Trust: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 46 |  |  | — |  |  | — |  |  | $ | 46 |
Fixed income securities |  | 4,801 |  |  | — |  |  | — |  |  | 4,801 |
Equity securities |  | 7,149 |  |  | — |  |  | — |  |  | 7,149 |
Total investments measured at fair value |  | $ | 11,996 |  |  | — |  |  | — |  |  | $ | 11,996 |
Schedule of estimated future benefit payments | Estimated future benefit payments for the SERP at December 31, 2017 for the next ten years are as follows (in thousands):
2018 | $ | 409 |
2019 | 754 |
2020 | 1,278 |
2021 | 1,334 |
2022 | 1,326 |
Thereafter | 7,276 |
Total | $ | 12,377 |

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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