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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015:
|  | Pension Benefits |  | Post-Retirement Medical Benefits
(dollars in thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Change in Projected Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 168,934 |  |  | $ | 185,184 |  |  | $ | 9,393 |  |  | $ | 12,326 |
Service cost |  | 5,094 |  |  | 6,276 |  |  | 247 |  |  | 340 |
Interest cost |  | 7,910 |  |  | 7,686 |  |  | 371 |  |  | 435 |
Actuarial (gain) loss |  | 4,162 |  |  | (24,413 | ) |  | (715 | ) |  | (3,375 | )
Benefits/expenses paid |  | (5,736 | ) |  | (5,799 | ) |  | (494 | ) |  | (333 | )
Projected benefit obligation at end of year |  | $ | 180,364 |  |  | $ | 168,934 |  |  | $ | 8,802 |  |  | $ | 9,393 |
Changes in Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 142,174 |  |  | $ | 140,561 |  |  | $ | 10,614 |  |  | $ | 10,723 |
Actual return on plan assets |  | 9,182 |  |  | 673 |  |  | 418 |  |  | 115 |
Employer contributions |  | 5,252 |  |  | 6,739 |  |  | — |  |  | 109 |
Benefits/expenses paid |  | (5,736 | ) |  | (5,799 | ) |  | (494 | ) |  | (333 | )
Fair value of plan assets at end of year |  | $ | 150,872 |  |  | $ | 142,174 |  |  | $ | 10,538 |  |  | $ | 10,614 |
Funded Status: |  |  |  |  |  |  |  |  |  |  |  |
Net amount recognized as accrued pension cost |  | $ | (29,492 | ) |  | $ | (26,760 | ) |  | $ | 1,736 |  |  | $ | 1,221 |
|  | Pension Benefits |  | Post-Retirement Medical Benefits
(in thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Amounts recognized on the balance sheets: |  |  |  |  |  |  |  |  |  |  |  |
Non-current assets |  | $ | — |  |  | $ | — |  |  | $ | 1,736 |  |  | $ | 1,221 |
Current liabilities |  | — |  |  | — |  |  | — |  |  | — |
Non-current liabilities |  | (29,492 | ) |  | (26,760 | ) |  | — |  |  | — |
Net amount recognized |  | $ | (29,492 | ) |  | $ | (26,760 | ) |  | $ | 1,736 |  |  | $ | 1,221 |
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | — |  |  | $ | 49 |  |  | $ | — |  |  | $ | (34 | )
Net (gain) loss |  | 25,828 |  |  | 21,921 |  |  | (5,515 | ) |  | (5,572 | )
Regulatory assets (liabilities) |  | 25,828 |  |  | 21,970 |  |  | (5,515 | ) |  | (5,606 | )
Unfunded accrued pension cost |  | 3,664 |  |  | 4,790 |  |  | 3,779 |  |  | 4,385 |
Net liability (asset) recognized |  | $ | 29,492 |  |  | $ | 26,760 |  |  | $ | (1,736 | ) |  | $ | (1,221 | )
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset at beginning of year |  | $ | 21,970 |  |  | $ | 39,170 |  |  | $ | (5,606 | ) |  | $ | (3,125 | )
Net loss (gain) |  | 4,818 |  |  | (15,292 | ) |  | (644 | ) |  | (2,997 | )
Amortization of prior service (cost) credit |  | (49 | ) |  | (118 | ) |  | 34 |  |  | 200 |
Amortization of net gain (loss) |  | (911 | ) |  | (1,790 | ) |  | 701 |  |  | 316 |
Total change in regulatory asset |  | 3,858 |  |  | (17,200 | ) |  | 91 |  |  | (2,481 | )
Regulatory asset (liability) at end of year |  | $ | 25,828 |  |  | $ | 21,970 |  |  | $ | (5,515 | ) |  | $ | (5,606 | )
Net periodic pension costs |  | $ | 4,126 |  |  | $ | 6,075 |  |  | $ | (606 | ) |  | $ | (234 | )
Change in regulatory asset |  | 3,858 |  |  | (17,200 | ) |  | 91 |  |  | (2,481 | )
Total recognized in net periodic pension cost and regulatory asset (liability) |  | $ | 7,984 |  |  | $ | (11,125 | ) |  | $ | (515 | ) |  | $ | (2,715 | )
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |  |  |  |  |  |  |
Prior service (cost) credit |  | $ | — |  |  | $ | (49 | ) |  | $ | — |  |  | $ | 34 |
Net gain (loss) |  | $ | (835 | ) |  | $ | (510 | ) |  | $ | 679 |  |  | $ | 599 |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation |  | $ | 180,364 |  |  | $ | 168,934 |  |  | $ | 8,802 |  |  | $ | 9,393 |
Accumulated benefit obligation |  | $ | 165,998 |  |  | $ | 155,469 |  |  | N/A |  | N/A
Fair value of plan assets |  | $ | 150,872 |  |  | $ | 142,174 |  |  | $ | 10,538 |  |  | $ | 10,614 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.44 | % |  | 4.65 | % |  | 3.97 | % |  | 4.25 | %
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 2016, 2015 and 2014 are as follows:
|  | Pension Benefits |  | Post-Retirement Medical Benefits
(dollars in thousands, except percent) |  | 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 5,094 |  |  | $ | 6,276 |  |  | $ | 5,643 |  |  | $ | 247 |  |  | $ | 340 |  |  | $ | 348 |
Interest cost |  | 7,910 |  |  | 7,686 |  |  | 7,520 |  |  | 371 |  |  | 435 |  |  | 495 |
Expected return on plan assets |  | (9,838 | ) |  | (9,795 | ) |  | (8,898 | ) |  | (489 | ) |  | (493 | ) |  | (453 | )
Amortization of transition |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 418 |
Amortization of prior service cost (credit) |  | 49 |  |  | 118 |  |  | 118 |  |  | (34 | ) |  | (200 | ) |  | (200 | )
Amortization of actuarial (gain) loss |  | 911 |  |  | 1,790 |  |  | — |  |  | (701 | ) |  | (316 | ) |  | (330 | )
Net periodic pension cost under accounting standards |  | $ | 4,126 |  |  | $ | 6,075 |  |  | $ | 4,383 |  |  | $ | (606 | ) |  | $ | (234 | ) |  | $ | 278 |
Regulatory adjustment - over collection |  | 859 |  |  | 523 |  |  | 1,622 |  |  | — |  |  | — |  |  | — |
Total expense recognized, before allocation to overhead pool |  | $ | 4,985 |  |  | $ | 6,598 |  |  | $ | 6,005 |  |  | $ | (606 | ) |  | $ | (234 | ) |  | $ | 278 |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.65 | % |  | 4.25 | % |  | 5.10 | % |  | 4.25 | % |  | 3.80 | % |  | 4.65 | %
Expected long-term return on plan assets |  | 7.00 | % |  | 7.00 | % |  | 7.00 | % |  | * |  |  | * |  |  | * |
Rate of compensation increase |  | ** |  |  | 4.00 | % |  | 4.00 | % |  | N/A |  |  | N/A |  |  | N/A |
*7.0% for union plan, 4.2% for non-union, net of income taxes in 2016, 2015 and 2014.
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, 2016 and 2015, by asset category are as follows:
|  | Pension Benefits |  | Post-Retirement Medical Benefits
Asset Category |  | 2016 |  | 2015 |  | 2016 |  | 2015
Actual Asset Allocations: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | 57 | % |  | 55 | % |  | 58 | % |  | 60 | %
Debt securities |  | 38 | % |  | 40 | % |  | 39 | % |  | 38 | %
Real Estate Funds |  | 5 | % |  | 5 | % |  | — | % |  | — | %
Cash equivalents |  | — | % |  | — | % |  | 3 | % |  | 2 | %
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, 2016 and 2015.
Target Asset Allocations for 2016: |  | 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, 2016 and 2015:
|  | 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 |  |  | — |  |  |  |  |
|  | Net Asset Value as of December 31, 2015
(dollars in thousands) |  | Fair Value |  | Unfunded Commitments |  | Redemption Frequency |  | Redemption Notice Period
Cash equivalents |  | $ | 469 |  |  | — |  |  | N/A |  | N/A
Fixed income fund |  | 56,218 |  |  | — |  |  | Daily |  | Daily
Equity securities: |  |  |  |  |  |  |  |
U.S. small/mid cap funds |  | 21,219 |  |  | — |  |  | Daily |  | Daily
U.S. large cap funds |  | 42,395 |  |  | — |  |  | Daily |  | Daily
International funds |  | 14,455 |  |  | — |  |  | Daily |  | Daily
Total equity funds |  | 78,069 |  |  | — |  |  |  |  |
Real estate funds |  | 7,418 |  |  | — |  |  | Daily |  | Daily
Total |  | $ | 142,174 |  |  | — |  |  |  |  |
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, 2016 and 2015:
|  | 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 |
|  | Fair Value as of December 31, 2015
(dollars in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fair Value of Post-Retirement Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 31 |  |  | — |  |  | — |  |  | $ | 31 |
Fixed income |  | 4,182 |  |  | — |  |  | — |  |  | 4,182 |
U.S. equity securities (large cap stocks) |  | 6,401 |  |  | — |  |  | — |  |  | 6,401 |
Total investments measured at fair value |  | $ | 10,614 |  |  | — |  |  | — |  |  | $ | 10,614 |
Schedule of estimated future benefit payments | stimated future benefit payments at December 31, 2016 for the next five years and thereafter are as follows (in thousands):
| Pension Benefits |  | Post-Retirement Medical Benefits
2017 | $ | 6,385 |  |  | $ | 560 |
2018 | 6,855 |  |  | 609 |
2019 | 7,354 |  |  | 633 |
2020 | 7,945 |  |  | 680 |
2021 | 8,542 |  |  | 768 |
Thereafter | 51,307 |  |  | 3,719 |
Total | $ | 88,388 |  |  | $ | 6,969 |
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 |  | $ | 55 |  |  | $ | (47 | )
Effect on post-retirement benefit obligation |  | $ | 914 |  |  | $ | (790 | )
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, 2016 and 2015:
(dollars in thousands) |  | 2016 |  | 2015
Change in Benefit Obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 16,317 |  |  | $ | 15,926 |
Service cost |  | 799 |  |  | 814 |
Interest cost |  | 743 |  |  | 653 |
Actuarial (gain) loss |  | 3,341 |  |  | (683 | )
Benefits paid |  | (417 | ) |  | (393 | )
Benefit obligation at end of year |  | $ | 20,783 |  |  | $ | 16,317 |
Changes in Plan Assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | — |  |  | — |
Fair value of plan assets at end of year |  | — |  |  | — |
Funded Status: |  |  |  |  |  |
Net amount recognized as accrued cost |  | $ | (20,783 | ) |  | $ | (16,317 | )
The change in actuarial gain/loss in the SERP was due, in part, to a decrease in the discount rate during 2016, while the discount rate increased during 2015.
(in thousands) |  | 2016 |  | 2015
Amounts recognized on the balance sheets: |  |  |  |  |  |
Current liabilities |  | $ | (419 | ) |  | $ | (411 | )
Non-current liabilities |  | (20,364 | ) |  | (15,906 | )
Net amount recognized |  | $ | (20,783 | ) |  | $ | (16,317 | )
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost |  | $ | 11 |  |  | $ | 36 |
Net loss |  | 6,463 |  |  | 3,416 |
Regulatory assets |  | 6,474 |  |  | 3,452 |
Unfunded accrued cost |  | 14,309 |  |  | 12,865 |
Net liability recognized |  | $ | 20,783 |  |  | $ | 16,317 |
Changes in plan assets and benefit obligations recognized in regulatory assets consist of: |  |  |  |  |  |
Regulatory asset at beginning of year |  | $ | 3,452 |  |  | $ | 4,683 |
Net (gain) loss |  | 3,339 |  |  | (683 | )
Amortization of prior service credit |  | (25 | ) |  | (117 | )
Amortization of net loss |  | (292 | ) |  | (431 | )
Total change in regulatory asset |  | 3,022 |  |  | (1,231 | )
Regulatory asset at end of year |  | $ | 6,474 |  |  | $ | 3,452 |
Net periodic pension cost |  | $ | 1,859 |  |  | $ | 2,015 |
Change in regulatory asset |  | 3,022 |  |  | (1,231 | )
Total recognized in net periodic pension and regulatory asset |  | $ | 4,881 |  |  | $ | 784 |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net asset (obligation) |  | $ | — |  |  | $ | — |
Prior service cost |  | (11 | ) |  | (25 | )
Net loss |  | (777 | ) |  | (292 | )
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  | $ | 20,783 |  |  | $ | 16,317 |
Accumulated benefit obligation |  | 17,144 |  |  | 14,533 |
Fair value of plan assets |  | — |  |  | — |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |  |  |
Discount rate |  | 4.34 | % |  | 4.61 | %
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 2016, 2015 and 2014 are as follows:
(dollars in thousands, except percent) |  | 2016 |  | 2015 |  | 2014
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |
Service cost |  | $ | 799 |  |  | $ | 814 |  |  | $ | 768 |
Interest cost |  | 743 |  |  | 653 |  |  | 615 |
Amortization of prior service cost |  | 25 |  |  | 117 |  |  | 161 |
Amortization of net loss |  | 292 |  |  | 431 |  |  | 139 |
Net periodic pension cost |  | $ | 1,859 |  |  | $ | 2,015 |  |  | $ | 1,683 |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |  |  |  |
Discount rate |  | 4.61 | % |  | 4.15 | % |  | 5.05 | %
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, 2016 and 2015:
|  | 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 |
|  | Fair Value as of December 31, 2015
(dollars in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fair Value of Assets held in Rabbi Trust: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 39 |  |  | — |  |  | — |  |  | $ | 39 |
Fixed income securities |  | 3,903 |  |  | — |  |  | — |  |  | 3,903 |
Equity securities |  | 5,924 |  |  | — |  |  | — |  |  | 5,924 |
Total investments measured at fair value |  | $ | 9,866 |  |  | — |  |  | — |  |  | $ | 9,866 |
Schedule of estimated future benefit payments | Estimated future benefit payments for the SERP at December 31, 2016 for the next ten years are as follows (in thousands):
2017 | $ | 419 |
2018 | 664 |
2019 | 731 |
2020 | 1,246 |
2021 | 1,302 |
Thereafter | 6,714 |
Total | $ | 11,076 |

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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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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=58740216&loc=d3e1928-114920 + Details
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