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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of amounts recognized in balance sheet | Changes in benefit obligation and plan assets for the years ended December 31, 2017 and 2016, and amounts recognized in the Consolidated Balance Sheets at December 31, 2017 and 2016, were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |
| (In thousands)
Change in benefit obligation: |  |  |  |
Benefit obligation at beginning of year | $ | 436,307 |  | $ | 442,960 |  | $ | 89,304 |  | $ | 92,734 |
Service cost | — |  | — |  | 1,508 |  | 1,647 |
Interest cost | 16,207 |  | 17,218 |  | 3,265 |  | 3,688 |
Plan participants' contributions | — |  | — |  | 1,368 |  | 1,405 |
Actuarial (gain) loss | 19,119 |  | 1,882 |  | 1,781 |  | (3,872 | )
Benefits paid | (25,710 | ) | (25,753 | ) | (6,020 | ) | (6,298 | )
Benefit obligation at end of year | 445,923 |  | 436,307 |  | 91,206 |  | 89,304 |
Change in net plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 333,509 |  | 332,667 |  | 82,846 |  | 82,593 |
Actual gain on plan assets | 45,473 |  | 26,595 |  | 9,612 |  | 4,184 |
Employer contribution | 1,112 |  | — |  | 933 |  | 962 |
Plan participants' contributions | — |  | — |  | 1,368 |  | 1,405 |
Benefits paid | (25,710 | ) | (25,753 | ) | (6,020 | ) | (6,298 | )
Fair value of net plan assets at end of year | 354,384 |  | 333,509 |  | 88,739 |  | 82,846 |
Funded status - under | $ | (91,539 | ) | $ | (102,798 | ) | $ | (2,467 | ) | $ | (6,458 | )
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |  |  |  |  |
Deferred charges and other assets - other | $ | — |  | $ | — |  | $ | 19,114 |  | $ | 13,131 |
Other accrued liabilities | — |  | — |  | 612 |  | 538 |
Deferred credits and other liabilities - other | 91,539 |  | 102,798 |  | 20,969 |  | 19,051 |
Benefit obligation liabilities - net amount recognized | $ | (91,539 | ) | $ | (102,798 | ) | $ | (2,467 | ) | $ | (6,458 | )
Amounts recognized in accumulated other comprehensive (income) loss or regulatory assets (liabilities) consist of: |  |  |  |  |  |  |  |
Actuarial loss | $ | 186,486 |  | $ | 198,668 |  | $ | 13,423 |  | $ | 17,470 |
Prior service credit | — |  | — |  | (11,632 | ) | (13,003 | )
Total | $ | 186,486 |  | $ | 198,668 |  | $ | 1,791 |  | $ | 4,467 |
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:
| 2017 |  | 2016 |
| (In thousands)
Projected benefit obligation | $ | 445,923 |  | $ | 436,307 |
Accumulated benefit obligation | $ | 445,923 |  | $ | 436,307 |
Fair value of plan assets | $ | 354,384 |  | $ | 333,509 |
Components of net periodic benefit cost | Components of net periodic benefit cost (credit) for the Company's pension and other postretirement benefit plans for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |
| (In thousands)
Components of net periodic benefit cost (credit): |  |  |  |  |  |
Service cost | $ | — |  | $ | — |  | $ | 86 |  | $ | 1,508 |  | $ | 1,647 |  | $ | 1,816 |
Interest cost | 16,207 |  | 17,218 |  | 17,141 |  | 3,265 |  | 3,688 |  | 3,607 |
Expected return on assets | (20,528 | ) | (20,924 | ) | (22,254 | ) | (4,641 | ) | (4,533 | ) | (4,795 | )
Amortization of prior service cost (credit) | — |  | — |  | 36 |  | (1,371 | ) | (1,371 | ) | (1,371 | )
Recognized net actuarial loss | 6,355 |  | 6,215 |  | 7,016 |  | 857 |  | 1,491 |  | 1,960 |
Curtailment loss | — |  | — |  | 258 |  | — |  | — |  | — |
Net periodic benefit cost (credit), including amount capitalized | 2,034 |  | 2,509 |  | 2,283 |  | (382 | ) | 922 |  | 1,217 |
Less amount capitalized | 310 |  | 381 |  | 316 |  | (370 | ) | (52 | ) | 120 |
Net periodic benefit cost (credit) | 1,724 |  | 2,128 |  | 1,967 |  | (12 | ) | 974 |  | 1,097 |
Other changes in plan assets and benefit obligations recognized in accumulated comprehensive (income) loss or regulatory assets (liabilities): |  |  |  |  |  |  |  |  |  |  |  |
Net (gain) loss | (5,827 | ) | (3,789 | ) | 8,257 |  | (3,190 | ) | (3,523 | ) | (1,336 | )
Amortization of actuarial loss | (6,355 | ) | (6,215 | ) | (7,016 | ) | (857 | ) | (1,491 | ) | (1,960 | )
Amortization of prior service (cost) credit | — |  | — |  | (294 | ) | 1,371 |  | 1,371 |  | 1,371 |
Total recognized in accumulated other comprehensive (income) loss or regulatory assets (liabilities) | (12,182 | ) | (10,004 | ) | 947 |  | (2,676 | ) | (3,643 | ) | (1,925 | )
Total recognized in net periodic benefit cost (credit), accumulated other comprehensive (income) loss and regulatory assets (liabilities) | $ | (10,458 | ) | $ | (7,876 | ) | $ | 2,914 |  | $ | (2,688 | ) | $ | (2,669 | ) | $ | (828 | )
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
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Discount rate | 3.38 | % | 3.83 | % | 3.41 | % | 3.86 | %
Expected return on plan assets | 6.75 | % | 6.75 | % | 5.75 | % | 5.75 | %
Rate of compensation increase | N/A |  | N/A |  | 3.00 | % | 3.00 | %
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Discount rate | 3.83 | % | 4.00 | % | 3.86 | % | 4.06 | %
Expected return on plan assets | 6.75 | % | 6.75 | % | 5.75 | % | 5.75 | %
Rate of compensation increase | N/A |  | N/A |  | 3.00 | % | 3.00 | %
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:
|  |  | 2017 |  |  |  | 2016 |
Health care trend rate assumed for next year | 7.5 | % | – | 8.5 | % | 8.6 | % | – | 10.7 | %
Health care cost trend rate - ultimate |  |  |  | 4.5 | % |  |  |  | 4.5 | %
Year in which ultimate trend rate achieved |  |  | 2024 |  |  |  |  | 2024 |
Assumed health care cost trend rates | Assumed health care cost trend rates may have a significant effect on the amounts reported for the health care plans. A one percentage point change in the assumed health care cost trend rates would have had the following effects at December 31, 2017:
| 1 Percentage Point Increase |  | 1 Percentage Point Decrease |
| (In thousands)
Effect on total of service and interest cost components | $ | 306 |  | $ | (247 | )
Effect on postretirement benefit obligation | $ | 5,433 |  | $ | (4,551 | )
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, 2017, 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, 2017 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 3,814 |  | $ | — |  | $ | 3,814 |
Equity securities: |  |  |  |  |
U.S. companies | 13,345 |  | — |  | — |  | 13,345 |
International companies | 1,766 |  | — |  | — |  | 1,766 |
Collective and mutual funds* | 171,822 |  | 67,749 |  | — |  | 239,571 |
Corporate bonds | — |  | 74,956 |  | — |  | 74,956 |
Municipal bonds | — |  | 16,839 |  | — |  | 16,839 |
U.S. Government securities | 1,038 |  | — |  | — |  | 1,038 |
Total assets measured at fair value | $ | 187,971 |  | $ | 163,358 |  | $ | — |  | $ | 351,329 |
* | Collective and mutual funds invest approximately 31 percent in common stock of international companies, 28 percent in corporate bonds, 19 percent in common stock of large-cap U.S. companies, 7 percent in cash equivalents, 1 percent in U.S. Government securities and 14 percent in other investments.
| Fair Value Measurements at December 31, 2016, 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, 2016 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 6,347 |  | $ | — |  | $ | 6,347 |
Equity securities: |  |  |  |  |
U.S. companies | 11,348 |  | — |  | — |  | 11,348 |
International companies | 1,584 |  | — |  | — |  | 1,584 |
Collective and mutual funds* | 162,055 |  | 64,052 |  | — |  | 226,107 |
Corporate bonds | — |  | 68,677 |  | — |  | 68,677 |
Municipal bonds | — |  | 11,002 |  | — |  | 11,002 |
U.S. Government securities | 4,352 |  | 2,044 |  | — |  | 6,396 |
Total assets measured at fair value | $ | 179,339 |  | $ | 152,122 |  | $ | — |  | $ | 331,461 |
* | Collective and mutual funds invest approximately 29 percent in common stock of international companies, 21 percent in corporate bonds, 20 percent in common stock of large-cap U.S. companies, 8 percent in cash equivalents, 7 percent in U.S. Government securities and 15 percent in other investments.
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, 2017, 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, 2017 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 4,815 |  | $ | — |  | $ | 4,815 |
Equity securities: |  |  |  |  |
U.S. companies | 2,316 |  | — |  | — |  | 2,316 |
International companies | 4 |  | — |  | — |  | 4 |
Insurance contract* | 3 |  | 81,601 |  | — |  | 81,604 |
Total assets measured at fair value | $ | 2,323 |  | $ | 86,416 |  | $ | — |  | $ | 88,739 |
* | The insurance contract invests approximately 38 percent in corporate bonds, 23 percent in common stock of large-cap U.S. companies, 21 percent in U.S. Government securities, 9 percent in mortgage-backed securities and 9 percent in other investments.
| Fair Value Measurements at December 31, 2016, 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, 2016 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 250 |  | $ | — |  | $ | 250 |
Equity securities: |  |  |  |  |
U.S. companies | 2,328 |  | — |  | — |  | 2,328 |
International companies | 5 |  | — |  | — |  | 5 |
Insurance contract* | — |  | 80,263 |  | — |  | 80,263 |
Total assets measured at fair value | $ | 2,333 |  | $ | 80,513 |  | $ | — |  | $ | 82,846 |
* | The insurance contract invests approximately 38 percent in corporate bonds, 25 percent in common stock of large-cap U.S. companies, 20 percent in U.S. Government securities, 9 percent in mortgage-backed securities and 8 percent in other investments.
Benefit payments expected to be paid | The following benefit payments, which reflect future service, as appropriate, and expected Medicare Part D subsidies are as follows:
Years | Pension Benefits |  | Other Postretirement Benefits |  | Expected Medicare Part D Subsidy |
|  | (In thousands) |  |
2018 | $ | 25,111 |  | $ | 5,490 |  | $ | 152 |
2019 | 25,280 |  | 5,525 |  | 147 |
2020 | 25,587 |  | 5,396 |  | 141 |
2021 | 25,866 |  | 5,391 |  | 132 |
2022 | 26,185 |  | 5,470 |  | 123 |
2023 - 2027 | 130,994 |  | 27,106 |  | 454 |
Multiemployer plans |
| 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 | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2015 |
|  |  |  |  | (In thousands) |  |
Alaska Laborers-Employers Retirement Fund | 91-6028298-001 | Yellow as of 6/30/2017 | Yellow as of 6/30/2016 | Implemented | $ | 690 |  | $ | 766 |  | $ | 917 |  | No | 12/31/2018
Edison Pension Plan | 93-6061681-001 | Green | Green | No | 12,725 |  | 6,242 |  | 5,517 |  | No | 6/30/2019
IBEW Local No. 82 Pension Plan | 31-6127268-001 | Green as of 6/30/2017 | Green as of 6/30/2016 | No | 1,757 |  | 2,560 |  | 2,252 |  | No | 12/1/2019
IBEW Local 212 Pension Trust Fund | 31-6127280-001 | Green as of 4/30/2016 | Yellow as of 4/30/2015 | No | 1,312 |  | 1,146 |  | 937 |  | No | 6/2/2019
IBEW Local No. 357 Pension Plan A | 88-6023284-001 | Green | Green | No | 3,286 |  | 3,016 |  | 1,896 |  | No | 5/31/2018
IBEW Local 648 Pension Plan | 31-6134845-001 | Red as of 2/28/2017 | Red as of 2/29/2016 | Implemented | 2,254 |  | 773 |  | 745 |  | No | 9/2/2018
Idaho Plumbers and Pipefitters Pension Plan | 82-6010346-001 | Green as of 5/31/2017 | Green as of 5/31/2016 | No | 1,156 |  | 1,221 |  | 1,169 |  | No | 9/30/2019
Minnesota Teamsters Construction Division Pension Fund | 41-6187751-001 | Green as of 11/30/2016 | Green as of 11/30/2015 | No | 826 |  | 690 |  | 737 |  | No | 4/30/2019
National Automatic Sprinkler Industry Pension Fund | 52-6054620-001 | Red | Red | Implemented | 718 |  | 775 |  | 677 |  | No | 7/31/2018- 3/31/2021
National Electrical Benefit Fund | 53-0181657-001 | Green | Green | No | 8,891 |  | 6,366 |  | 5,271 |  | No | 10/31/2017- 3/31/2021
Sheet Metal Workers' Pension Plan of Southern CA, AZ and NV | 95-6052257-001 | Yellow | Red | Implemented | 1,016 |  | 1,087 |  | 714 |  | No | 6/30/2018
Southwest Marine Pension Trust | 95-6123404-001 | Red | Red | Implemented | 48 |  | 50 |  | 26 |  | No | 1/31/2019
Other funds |  |  |  |  | 22,066 |  | 19,835 |  | 18,254 |  |  |
Total contributions | $ | 56,745 |  | $ | 44,527 |  | $ | 39,112 |  |  |
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 | 2016 and 2015
IBEW Local 82 Pension Plan | 2016 and 2015
IBEW Local 124 Pension Trust Fund | 2016 and 2015
IBEW Local 212 Pension Trust Fund | 2016 and 2015
IBEW Local 357 Pension Plan A | 2016 and 2015
IBEW Local 648 Pension Plan | 2016 and 2015
Idaho Plumbers and Pipefitters Pension Plan | 2016 and 2015
International Union of Operating Engineers Local 701 Pension Trust Fund | 2016 and 2015
Minnesota Teamsters Construction Division Pension Fund | 2016 and 2015
Pension and Retirement Plan of Plumbers and Pipefitters Local 525 | 2016 and 2015

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&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=82843861&loc=d3e1928-114920 + Details
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