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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Schedule of amounts recognized in balance sheet | Changes in benefit obligation and plan assets and amounts recognized in the Consolidated Balance Sheets at December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2022 | 2021 | 2022 | 2021
Change in benefit obligation: | (In thousands)
Benefit obligation at beginning of year | $ | 411,497 |  | $ | 437,360 |  | $ | 73,460 |  | $ | 86,155 |
Service cost | — |  | — |  | 1,416 |  | 1,600 |
Interest cost | 10,522 |  | 9,819 |  | 1,896 |  | 1,862 |
Plan participants' contributions | — |  | — |  | 569 |  | 641 |
Actuarial gain | (85,303) |  | (12,140) |  | (18,401) |  | (12,802) |
Benefits paid | (24,672) |  | (23,542) |  | (4,009) |  | (3,996) |
Benefit obligation at end of year | 312,044 |  | 411,497 |  | 54,931 |  | 73,460 |
Change in net plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 373,109 |  | 383,834 |  | 100,158 |  | 101,639 |
Actual return on plan assets | (77,975) |  | 12,817 |  | (20,893) |  | 1,398 |
Employer contribution | — |  | — |  | 501 |  | 476 |
Plan participants' contributions | — |  | — |  | 569 |  | 641 |
Benefits paid | (24,672) |  | (23,542) |  | (4,009) |  | (3,996) |
Fair value of net plan assets at end of year | 270,462 |  | 373,109 |  | 76,326 |  | 100,158 |
Funded status - (under) over | $ | (41,582) |  | $ | (38,388) |  | $ | 21,395 |  | $ | 26,698 |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent assets - other | $ | — |  | $ | — |  | $ | 36,325 |  | $ | 45,863 |
Other accrued liabilities | — |  | — |  | 1,044 |  | 544 |
Noncurrent liabilities - other | 41,582 |  | 38,388 |  | 13,886 |  | 18,621 |
Benefit obligation (liabilities) assets - net amount recognized | $ | (41,582) |  | $ | (38,388) |  | $ | 21,395 |  | $ | 26,698 |
Amounts recognized in accumulated other comprehensive loss: |  |  |  |
Actuarial loss (gain) | $ | 32,378 |  | $ | 25,976 |  | $ | (2,923) |  | $ | 2,367 |
Prior service credit | — |  | — |  | (289) |  | (290) |
Total | $ | 32,378 |  | $ | 25,976 |  | $ | (3,212) |  | $ | 2,077 |
Amounts recognized in regulatory assets or liabilities: |  |  |  |
Actuarial loss (gain) | $ | 141,207 |  | $ | 142,166 |  | $ | (1,439) |  | $ | (14,727) |
Prior service credit | — |  | — |  | (3,796) |  | (5,193) |
Total | $ | 141,207 |  | $ | 142,166 |  | $ | (5,235) |  | $ | (19,920) |
The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with accumulated benefit obligations in excess of plan assets | The pension plans all have accumulated benefit obligations in excess of plan assets. The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for these plans at December 31 were as follows:
| 2022 |  | 2021 |
| (In thousands)
Projected benefit obligation | $ | 312,044 |  | $ | 411,497 |
Accumulated benefit obligation | $ | 312,044 |  | $ | 411,497 |
Fair value of plan assets | $ | 270,462 |  | $ | 373,109 |
The projected benefit obligation and accumulated benefit obligation for these plans at December 31 were as follows:
| 2022 |  | 2021 |
| (In thousands)
Projected benefit obligation | $ | 74,730 |  | $ | 92,918 |
Accumulated benefit obligation | $ | 74,730 |  | $ | 92,918 |
Components of net periodic benefit cost | The components of net periodic benefit cost (credit), other than the service cost component, are included in other income on the Consolidated Statements of Income. Prior service credit is amortized on a straight-line basis over the average remaining service period of active participants. These components related to the Company's pension and other postretirement benefit plans for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2022 | 2021 | 2020 | 2022 | 2021 | 2020
Components of net periodic benefit credit: | (In thousands)
Service cost | $ | — |  | $ | — |  | $ | — |  | $ | 1,416 |  | $ | 1,600 |  | $ | 1,532 |
Interest cost | 10,522 |  | 9,819 |  | 12,093 |  | 1,896 |  | 1,862 |  | 2,437 |
Expected return on assets | (19,455) |  | (19,576) |  | (19,949) |  | (5,288) |  | (5,098) |  | (5,019) |
Amortization of prior service credit | — |  | — |  | — |  | (1,398) |  | (1,398) |  | (1,398) |
Recognized net actuarial loss (gain) | 6,683 |  | 8,017 |  | 7,172 |  | (219) |  | 24 |  | 287 |
Net periodic benefit credit, including amount capitalized | (2,250) |  | (1,740) |  | (684) |  | (3,593) |  | (3,010) |  | (2,161) |
Less amount capitalized | — |  | — |  | — |  | 175 |  | 150 |  | 156 |
Net periodic benefit cost credit | (2,250) |  | (1,740) |  | (684) |  | (3,768) |  | (3,160) |  | (2,317) |
Other changes in plan assets and benefit obligations recognized in accumulated comprehensive loss: |  |  |  |  |  |
Net (gain) loss | 2,369 |  | (265) |  | 934 |  | (4,141) |  | (2,811) |  | (259) |
Amortization of actuarial loss | (1,310) |  | (1,286) |  | (1,155) |  | (281) |  | (135) |  | (306) |
Amortization of prior service credit | — |  | — |  | — |  | 125 |  | 100 |  | 101 |
Reclassification of postretirement liability adjustment from regulatory asset | 5,343 |  | — |  | — |  | (992) |  | — |  | — |
Total recognized in accumulated other comprehensive loss | 6,402 |  | (1,551) |  | (221) |  | (5,289) |  | (2,846) |  | (464) |
Other changes in plan assets and benefit obligations recognized in regulatory assets or liabilities: |  |  |  |  |  |
Net (gain) loss | 9,757 |  | (5,116) |  | 4,546 |  | 11,920 |  | (6,292) |  | (3,793) |
Amortization of actuarial gain (loss) | (5,373) |  | (6,731) |  | (6,017) |  | 500 |  | 110 |  | 19 |
Amortization of prior service credit | — |  | — |  | — |  | 1,273 |  | 1,298 |  | 1,297 |
Reclassification of postretirement liability adjustment from regulatory asset | (5,343) |  | — |  | — |  | 992 |  | — |  | — |
Total recognized in regulatory assets or liabilities | (959) |  | (11,847) |  | (1,471) |  | 14,685 |  | (4,884) |  | (2,477) |
Total recognized in net periodic benefit credit, accumulated other comprehensive loss and regulatory assets or liabilities | $ | 3,193 |  | $ | (15,138) |  | $ | (2,376) |  | $ | 5,628 |  | $ | (10,890) |  | $ | (5,258) |
The components of net periodic benefit cost are included in other income on the Consolidated Statements of Income. These components related to the Company's nonqualified defined benefit plans for the years ended December 31 were as follows:
| 2022 |  | 2021 |  | 2020 |
| (In thousands)
Components of net periodic benefit cost: |  |  |
Service cost | $ | — |  | $ | — |  | $ | 58 |
Interest cost | 2,142 |  | 1,912 |  | 2,606 |
Recognized net actuarial loss | 950 |  | 1,164 |  | 1,192 |
Net periodic benefit cost | $ | 3,092 |  | $ | 3,076 |  | $ | 3,856 |
Weighted average assumptions used to determine benefit obligations and net periodic benefit costs | Weighted average assumptions used to determine benefit obligations at December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2022 |  | 2021 |  | 2022 |  | 2021 |
Discount rate | 5.06 | % | 2.64 | % | 5.07 | % | 2.66 | %
Expected return on plan assets | 6.50 | % | 6.00 | % | 6.00 | % | 5.50 | %
Rate of compensation increase | N/A | N/A | 3.00 | % | 3.00 | %
Weighted average assumptions used to determine net periodic benefit cost (credit) for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2022 | 2021 | 2022 | 2021
Discount rate | 2.64 | % | 2.30 | % | 2.66 | % | 2.30 | %
Expected return on plan assets | 6.00 | % | 6.00 | % | 5.50 | % | 5.50 | %
Rate of compensation increase | N/A | N/A | 3.00 | % | 3.00 | %
Weighted average assumptions used at December 31 were as follows:
| 2022 |  | 2021 |
Benefit obligation discount rate | 4.97 | % | 2.39 | %
Benefit obligation rate of compensation increase | N/A | N/A
Net periodic benefit cost discount rate | 2.39 | % | 1.97 | %
Net periodic benefit cost rate of compensation increase | N/A | N/A
Health care rate assumptions for the Company's other postretirement benefit plans | Health care rate assumptions for the Company's other postretirement benefit plans as of December 31 were as follows:
| 2022 |  | 2021 |
Health care trend rate assumed for next year | 7.5 | % | 7.0 | %
Health care cost trend rate - ultimate | 4.5 | % | 4.5 | %
Year in which ultimate trend rate achieved | 2033 | 2031
Benefit payments expected to be paid | The following benefit payments, which reflect future service, as appropriate, and expected Medicare Part D subsidies at December 31, 2022, are as follows:
Years | Pension Benefits | Other Postretirement Benefits | Expected Medicare Part D Subsidy
|  | (In thousands) |
2023 | $ | 24,936 |  | $ | 4,275 |  | $ | 62 |
2024 | 24,882 |  | 4,371 |  | 53 |
2025 | 24,749 |  | 4,456 |  | 46 |
2026 | 24,605 |  | 4,509 |  | 39 |
2027 | 24,387 |  | 4,523 |  | 31 |
2028-2032 | 114,850 |  | 16,917 |  | 93 |
The amount of future benefit payments for the unfunded, nonqualified defined benefit plans at December 31, 2022, are expected to aggregate as follows:
| 2023 | 2024 | 2025 | 2026 | 2027 | 2028-2032
| (In thousands)
Nonqualified benefits | $ | 6,651 |  | $ | 7,183 |  | $ | 7,430 |  | $ | 7,537 |  | $ | 7,420 |  | $ | 29,930 |
The fair value of the pension and postretirement net plan assets by class | The fair value of the Company's pension plans' assets (excluding cash) by class were as follows:
| Fair Value Measurements at December 31, 2022, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2022
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 8,170 |  | $ | — |  | $ | 8,170 |
Equity securities: |  |  |  |
U.S. companies | 7,388 |  | — |  | — |  | 7,388 |
International companies | — |  | 467 |  | — |  | 467 |
Collective and mutual funds (a) | 121,072 |  | 33,371 |  | — |  | 154,443 |
Corporate bonds | — |  | 81,363 |  | — |  | 81,363 |
Municipal bonds | — |  | 5,904 |  | — |  | 5,904 |
U.S. Government securities | 3,044 |  | 880 |  | — |  | 3,924 |
Pooled separate accounts (b) | — |  | 3,241 |  | — |  | 3,241 |
Investments measured at net asset value (c) | — |  | — |  | — |  | 5,562 |
Total assets measured at fair value | $ | 131,504 |  | $ | 133,396 |  | $ | — |  | $ | 270,462 |
(a)Collective and mutual funds invest approximately 29 percent in corporate bonds, 24 percent in common stock of large-cap U.S. companies, 16 percent in common stock of international companies, 7 percent cash and cash equivalents, 7 percent in U.S. Government securities and 17 percent in other investments. (b)Pooled separate accounts are invested 100 percent in cash and cash equivalents. (c)In accordance with ASC 820 - Fair Value Measurements, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the line items presented in the Consolidated Balance Sheets.
| Fair Value Measurements at December 31, 2021, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2021
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 4,637 |  | $ | — |  | $ | 4,637 |
Equity securities: |  |  |  |
U.S. companies | 7,483 |  | — |  | — |  | 7,483 |
International companies | — |  | 1,279 |  | — |  | 1,279 |
Collective and mutual funds (a) | 167,093 |  | 41,383 |  | — |  | 208,476 |
Corporate bonds | — |  | 125,167 |  | — |  | 125,167 |
Municipal bonds | — |  | 7,507 |  | — |  | 7,507 |
U.S. Government securities | 7,113 |  | 1,902 |  | — |  | 9,015 |
Pooled separate accounts (b) | — |  | 3,088 |  | — |  | 3,088 |
Investments measured at net asset value (c) | — |  | — |  | — |  | 6,457 |
Total assets measured at fair value | $ | 181,689 |  | $ | 184,963 |  | $ | — |  | $ | 373,109 |
(a)Collective and mutual funds invest approximately 37 percent in corporate bonds, 19 percent in common stock of international companies, 16 percent in common stock of large-cap U.S. companies, 9 percent in U.S. Government securities and 19 percent in other investments. (b)Pooled separate accounts are invested 100 percent in cash and cash equivalents. (c)In accordance with ASC 820 - Fair Value Measurements, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the line items presented in the Consolidated Balance Sheets. The fair value of the Company's other postretirement benefit plans' assets (excluding cash) by asset class were as follows:
| Fair Value Measurements at December 31, 2022, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2022
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 4,196 |  | $ | — |  | $ | 4,196 |
Equity securities: |  |  |  |
U.S. companies | 2,572 |  | — |  | — |  | 2,572 |
Collective and mutual funds (a) | 5 |  | 5 |  | — |  | 10 |
Insurance contract (b) | — |  | 69,548 |  | — |  | 69,548 |
Total assets measured at fair value | $ | 2,577 |  | $ | 73,749 |  | $ | — |  | $ | 76,326 |
(a)Collective and mutual funds invest approximately 29 percent in corporate bonds, 24 percent in common stock of large-cap U.S. companies,16 percent in common stock of international companies, 7 percent in cash and cash equivalents,7 percent in U.S. Government securities and 17 percent in other investments. (b)The insurance contract invests approximately 69 percent in corporate bonds, 13 percent in U.S. Government securities, 14 percent in common stock of large-cap U.S. companies and 4 percent in common stock of small-cap U.S. companies.
| Fair Value Measurements at December 31, 2021, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2021
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 4,281 |  | $ | — |  | $ | 4,281 |
Equity securities: |  |  |  |
U.S. companies | 2,332 |  | — |  | — |  | 2,332 |
International companies | — |  | 1 |  | — |  | 1 |
Collective and mutual funds (a) | 4 |  | 90 |  | — |  | 94 |
Insurance contract (b) | — |  | 93,447 |  | — |  | 93,447 |
Investments measured at net asset value (c) | — |  | — |  | — |  | 3 |
Total assets measured at fair value | $ | 2,336 |  | $ | 97,819 |  | $ | — |  | $ | 100,158 |
(a)Collective and mutual funds invest approximately 37 percent in corporate bonds, 19 percent in common stock of international companies, 16 percent in common stock of large-cap U.S. companies, 9 percent in U.S. Government securities and 19 percent in other investments. (b)The insurance contract invests approximately 58 percent in corporate bonds, 13 percent in common stock of large-cap U.S. companies, 13 percent in U.S. Government securities, 5 percent in common stock of small-cap U.S. companies and 11 percent in other investments. (c)In accordance with ASC 820 - Fair Value Measurements, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the line items presented in the Consolidated Balance Sheets. The amount of investments that the Company anticipates using to satisfy obligations under these plans at December 31 was as follows:
| 2022 |  | 2021 |
| (In thousands)
Investments |  |
Insurance contracts* | $ | 98,041 |  | $ | 109,603 |
Life insurance** | 38,448 |  | 38,356 |
Other | 7,361 |  | 10,190 |
Total investments | $ | 143,850 |  | $ | 158,149 |
*For more information on the insurance contracts, see Note 8. **Investments of life insurance are carried on plan participants (payable upon the employee's death).
Schedule of Multiemployer Plans [Table Text Block] |
| EIN/Pension Plan Number | Pension Protection Act Zone Status | FIP/RP Status Pending/Implemented | Contributions | Surcharge Imposed | Expiration Date of Collective Bargaining Agreement |
Pension Fund | 2022 | 2021 | 2022 |  | 2021 |  | 2020 |  |
|  |  |  |  | (In thousands) |  |  |
Edison Pension Plan | 936061681-001 | Green | Green | No | $ | 18,750 |  | $ | 18,331 |  | $ | 16,121 |  | No | 12/31/2023 |
IBEW Local 212 Pension Trust | 316127280-001 | Green as of 4/30/2021 | Green as of 4/30/2021 | No | 1,622 |  | 1,733 |  | 1,521 |  | No | 6/1/2025 |
IBEW Local 357 Pension Plan A | 886023284-001 | Green | Green | No | 12,876 |  | 6,485 |  | 9,913 |  | No | 5/31/2024 |
IBEW Local 82 Pension Plan | 316127268-001 | Green as of 6/30/2022 | Green as of 6/30/2021 | No | 1,854 |  | 1,353 |  | 1,373 |  | No | 12/3/2023 |
IBEW Local 648 Pension Plan | 316134845-001 | Yellow as of 2/28/2022 | Yellow as of 02/28/2021 | Implemented | 915 |  | 706 |  | 526 |  | No | 9/1/2024 |
IBEW Local 683 Pension Fund Pension Plan | 341442087-001 | Green | Green | No | 3,362 |  | 1,238 |  | 1,240 |  | No | 5/26/2024 |
Idaho Plumbers and Pipefitters Pension Plan | 826010346-001 | Green as of 5/31/2022 | Green as of 5/31/2021 | No | 1,613 |  | 1,528 |  | 1,370 |  | No | 3/31/2023 |
National Electrical Benefit Fund | 530181657-001 | Green | Green | No | 18,060 |  | 14,361 |  | 14,484 |  | No | 5/31/2022- 5/31/2027 | *
Pension and Retirement Plan of Plumbers and Pipefitters Local 525 | 886003864-001 | Green as of 6/30/2022 | Green as of 6/30/2021 | No | 6,304 |  | 4,345 |  | 6,266 |  | No | 9/30/2024 |
Pension Trust Fund for Operating Engineers | 946090764-001 | Yellow | Yellow | Implemented | 2,484 |  | 2,495 |  | 2,680 |  | No | 3/31/2023- 6/15/2026 |
Sheet Metal Workers Pension Plan of Southern CA, AZ, and NV | 956052257-001 | Green | Yellow | Implemented | 3,400 |  | 2,615 |  | 3,255 |  | No | 6/30/2024 |
Western Conference of Teamsters Pension Plan | 916145047-001 | Green | Green | No | 3,127 |  | 3,006 |  | 3,025 |  | No | 12/31/2023- 12/31/2025 |
Other funds |  |  |  |  | 26,909 |  | 24,192 |  | 23,670 |  |  |  |
Total contributions | $ | 101,276 |  | $ | 82,388 |  | $ | 85,444 |  |  |  |
*Plan includes contributions required by collective bargaining agreements which have expired but contain provisions automatically renewing their terms in the absence of a subsequent negotiated agreement. The Company was listed in the plans' Forms 5500 as providing more than 5 percent of the total contributions for the following plans and plan years:
Pension Fund | Year Contributions to Plan Exceeded More Than 5 Percent of Total Contributions (as of December 31 of the Plan's Year-End)
Edison Pension Plan | 2021 and 2020
IBEW Local 82 Pension Plan | 2021 and 2020
IBEW Local 124 Pension Trust Fund | 2021 and 2020
IBEW Local 212 Pension Trust Fund | 2021 and 2020
IBEW Local 357 Pension Plan A | 2021 and 2020
IBEW Local 648 Pension Plan | 2021 and 2020
IBEW Local 683 Pension Fund Pension Plan | 2021 and 2020
IBEW Local Union No 226 Open End Pension Fund | 2020
Idaho Plumbers and Pipefitters Pension Plan | 2021 and 2020
International Union of Operating Engineers Local 701 Pension Trust Fund | 2021 and 2020
Minnesota Teamsters Construction Division Pension Fund | 2021 and 2020
Pension and Retirement Plan of Plumbers and Pipefitters Local 525 | 2021 and 2020
Southwest Marine Pension Trust | 2021 and 2020

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