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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
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 BenefitsOther
Postretirement Benefits
 2020201920202019
Change in benefit obligation:(In thousands)
Benefit obligation at beginning of year$421,166 $391,602 $83,614 $81,201 
Service cost— — 1,532 1,142 
Interest cost12,093 15,225 2,437 2,986 
Plan participants' contributions— — 752 1,040 
Actuarial loss27,737 40,219 2,203 2,632 
Benefits paid(23,636)(25,880)(4,383)(5,387)
Benefit obligation at end of year437,360 421,166 86,155 83,614 
Change in net plan assets:    
Fair value of plan assets at beginning of year365,264 307,809 94,587 82,516 
Actual return on plan assets42,206 58,409 10,249 15,731 
Employer contribution— 24,926 434 687 
Plan participants' contributions— — 752 1,040 
Benefits paid(23,636)(25,880)(4,383)(5,387)
Fair value of net plan assets at end of year383,834 365,264 101,639 94,587 
Funded status - over (under)$(53,526)$(55,902)$15,484 $10,973 
Amounts recognized in the Consolidated Balance Sheets at December 31:    
Noncurrent assets - other$— $— $36,769 30,475 
Other accrued liabilities— — 622 647 
Noncurrent liabilities - other53,526 55,902 20,663 18,855 
Benefit obligation assets (liabilities) - net amount recognized$(53,526)$(55,902)$15,484 $10,973 
Amounts recognized in accumulated other comprehensive loss:
    
Actuarial loss$27,527 $27,748 $5,557 $6,118 
Prior service credit— — (634)(731)
Total$27,527 $27,748 $4,923 $5,387 
Amounts recognized in regulatory assets or liabilities:
    
Actuarial (gain) loss$154,013 $155,484 $(8,228)$(4,450)
Prior service credit— — (6,808)(8,109)
Total$154,013 $155,484 $(15,036)$(12,559)
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:
 2020 2019 
 (In thousands)
Projected benefit obligation$437,360 $421,166 
Accumulated benefit obligation$437,360 $421,166 
Fair value of plan assets$383,834 $365,264 
The projected benefit obligation and accumulated benefit obligation for these plans at December 31 were as follows:
 2020 2019 
 (In thousands)
Projected benefit obligation$101,242 $99,245 
Accumulated benefit obligation$101,242 $99,245 
Components of net periodic benefit cost
The components of net periodic benefit cost (credit), other than the service cost component, are included in other income on the Consolidated Statements of Income. These components related to the Company's pension and other postretirement benefit plans for the years ended December 31 were as follows:
 Pension BenefitsOther
Postretirement Benefits
 202020192018202020192018
Components of net periodic benefit cost (credit):
(In thousands)
Service cost$— $— $— $1,532 $1,142 $1,494 
Interest cost12,093 15,225 14,591 2,437 2,986 2,899 
Expected return on assets(19,949)(18,236)(20,753)(5,019)(4,804)(4,866)
Amortization of prior service credit
— — — (1,398)(1,398)(1,394)
Recognized net actuarial loss7,172 5,548 7,005 287 353 640 
Net periodic benefit cost (credit), including amount capitalized
(684)2,537 843 (2,161)(1,721)(1,227)
Less amount capitalized— — — 156 113 153 
Net periodic benefit cost (credit)(684)2,537 843 (2,317)(1,834)(1,380)
Other changes in plan assets and benefit obligations recognized in accumulated comprehensive loss:
      
Net (gain) loss934 (144)991 (259)(127)(1,735)
Amortization of actuarial loss(1,155)(904)(1,084)(306)(110)(354)
Amortization of prior service (cost) credit
— — — 101 100 (220)
Total recognized in accumulated other comprehensive loss
(221)(1,048)(93)(464)(137)(2,309)
Other changes in plan assets and benefit obligations recognized in regulatory assets or liabilities:
      
Net (gain) loss4,546 189 8,263 (3,793)(8,168)(732)
Amortization of actuarial gain (loss)(6,017)(4,644)(5,921)19 (242)(286)
Amortization of prior service credit
— — — 1,297 1,297 1,614 
Total recognized in regulatory assets or liabilities
(1,471)(4,455)2,342 (2,477)(7,113)596 
Total recognized in net periodic benefit cost (credit), accumulated other comprehensive loss and regulatory assets or liabilities
$(2,376)$(2,966)$3,092 $(5,258)$(9,084)$(3,093)
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:
 2020 2019 2018 
 (In thousands)
Components of net periodic benefit cost:   
Service cost$58 $109 $185 
Interest cost2,606 3,473 3,157 
Recognized net actuarial loss1,192 764 1,047 
Net periodic benefit cost$3,856 $4,346 $4,389 
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 BenefitsOther
Postretirement Benefits
 2020 2019 2020 2019 
Discount rate2.30 %2.96 %2.30 %3.00 %
Expected return on plan assets6.00 %6.25 %5.50 %5.75 %
Rate of compensation increaseN/AN/A3.00 %3.00 %
Weighted average assumptions used to determine net periodic benefit cost (credit) for the years ended December 31 were as follows:
 Pension BenefitsOther
Postretirement Benefits
 2020201920202019
Discount rate2.96 %4.03 %3.00 %4.05 %
Expected return on plan assets6.25 %6.25 %5.75 %5.75 %
Rate of compensation increaseN/AN/A3.00 %3.00 %
Weighted average assumptions used at December 31 were as follows:
 2020 2019 
Benefit obligation discount rate1.97 %2.73 %
Benefit obligation rate of compensation increaseN/AN/A
Net periodic benefit cost discount rate2.73 %3.86 %
Net periodic benefit cost rate of compensation increaseN/AN/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:
 2020 2019
Health care trend rate assumed for next year7.0 %7.1 %–7.4 %
Health care cost trend rate - ultimate4.5 %4.5 %
Year in which ultimate trend rate achieved20312024
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, 2020:
 1 Percentage
Point Increase		1 Percentage
Point Decrease
 (In thousands)
Effect on total of service and interest cost components$182 $(154)
Effect on postretirement benefit obligation$3,846 $(3,304)
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, 2020, are as follows:
YearsPension
Benefits		Other
Postretirement Benefits		Expected
Medicare
Part D Subsidy
 (In thousands)
2021$24,455 $5,404 $95 
202224,507 5,437 89 
202324,733 5,424 83 
202424,835 5,377 75 
202524,713 5,277 70 
2026-2030119,191 25,949 252 
The amount of future benefit payments for the unfunded, nonqualified defined benefit plans at December 31, 2020, are expected to aggregate as follows:
202120222023202420252026-2030
(In thousands)
Nonqualified benefits$7,693 $6,957 $6,933 $7,299 $7,253 $33,938 
The fair value of the pension and postretirement net plan assets by class
The fair value of the Company's pension plans' assets (excluding cash) by class were as follows:
 Fair Value Measurements
at December 31, 2020, Using		 
 Quoted Prices
in Active
Markets for
Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
 (Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2020
 (In thousands)
Assets:    
Cash equivalents$— $7,841 $— $7,841 
Equity securities: 
U.S. companies12,844 — — 12,844 
International companies— 1,727 — 1,727 
Collective and mutual funds*177,397 55,788 — 233,185 
Corporate bonds— 92,809 — 92,809 
Municipal bonds— 10,126 — 10,126 
U.S. Government securities11,177 2,695 — 13,872 
Investments measured at net asset value— — — 11,430 
Total assets measured at fair value$201,418 $170,986 $— $383,834 
*Collective and mutual funds invest approximately 36 percent in corporate bonds, 24 percent in common stock of international companies, 18 percent in common stock of large-cap U.S. companies, 8 percent in cash equivalents, 5 percent in U.S. Government securities and 9 percent in other investments.
 Fair Value Measurements
at December 31, 2019, Using		 
 Quoted Prices
in Active
Markets for
Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
 (Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2019
 (In thousands)
Assets:    
Cash equivalents$— $26,166 $— $26,166 
Equity securities: 
U.S. companies14,457 — — 14,457 
International companies— 938 — 938 
Collective and mutual funds*160,906 58,894 — 219,800 
Corporate bonds— 80,768 — 80,768 
Municipal bonds— 11,828 — 11,828 
U.S. Government securities7,296 2,082 — 9,378 
Total assets measured at fair value$182,659 $180,676 $— $363,335 
*Collective and mutual funds invest approximately 29 percent in common stock of international companies, 21 percent in common stock of large-cap U.S. companies, 18 percent in U.S. Government securities, 9 percent in corporate bonds, 6 percent in cash equivalents and 17 percent in other investments.
The fair value of the Company's other postretirement benefit plans' assets (excluding cash) by asset class were as follows:
 Fair Value Measurements
at December 31, 2020, Using		 
 Quoted Prices
in Active
Markets for
Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
 (Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2020
 (In thousands)
Assets:    
Cash equivalents$— $3,517 $— $3,517 
Equity securities: 
U.S. companies1,850 — — 1,850 
International companies— 2 — 2 
Collective and mutual funds (a)10 147 — 157 
Insurance contract (b)— 96,103 — 96,103 
Investments measured at net asset value— — — 10 
Total assets measured at fair value$1,860 $99,769 $— $101,639 
(a)Collective and mutual funds invest approximately 36 percent in corporate bonds, 24 percent in common stock of international companies, 18 percent in common stock of large-cap U.S. companies, 8 percent in cash equivalents, 5 percent in U.S. Government securities and 9 percent in other investments.
(b)The insurance contract invests approximately 67 percent in corporate bonds, 12 percent in U.S. Government securities, 10 percent in common stock of large-cap U.S. companies, 4 percent in common stock of small-cap U.S. companies, 1 percent in cash equivalents and 6 percent in other investments.
 Fair Value Measurements
at December 31, 2019, Using		 
 Quoted Prices
in Active
Markets for
Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
 (Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2019
 (In thousands)
Assets:    
Cash equivalents$— $4,017 $— $4,017 
Equity securities: 
U.S. companies2,073 — — 2,073 
International companies— 1 — 1 
Collective and mutual funds (a)10 221 — 231 
Insurance contract (b)— 88,265 — 88,265 
Total assets measured at fair value$2,083 $92,504 $— $94,587 
(a)Collective and mutual funds invest approximately 29 percent in common stock of international companies, 21 percent in common stock of large-cap U.S. companies, 18 percent in U.S. Government securities, 9 percent in corporate bonds, 6 percent in cash equivalents and 17 percent in other investments.
(b)The insurance contract invests approximately 50 percent in corporate bonds, 25 percent in common stock of large-cap U.S. companies, 7 percent in U.S. Government securities, 7 percent in common stock of small-cap U.S. companies and 11 percent in other investments.
The amount of investments that the Company anticipates using to satisfy obligations under these plans at December 31 was as follows:
2020 2019 
(In thousands)
Investments
Insurance contract*$100,104 $87,009 
Life insurance**39,779 38,659 
Other8,917 8,450 
Total investments$148,800 $134,118 
*    For more information on the insurance contract, 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 NumberPension Protection Act Zone StatusFIP/RP Status Pending/ImplementedContributionsSurcharge ImposedExpiration Date
of Collective
Bargaining
Agreement
Pension Fund202020192020 2019 2018 
(In thousands)
Alaska Laborers-Employers Retirement Fund
91-6028298-001
Yellow as of 6/30/2020
Yellow as of 6/30/2019
Implemented$828 $815 $732 No12/31/2020*
Construction Industry and Laborers Joint Pension Trust for So Nevada, Plan A
88-0135695-001
RedRedImplemented515 544 346 No6/30/2023
Edison Pension Plan
93-6061681-001
GreenGreenNo16,121 12,252 12,111 No12/31/2021
IBEW Local 212 Pension Trust
31-6127280-001
Green as of 4/30/2020
Green as of 4/30/2019
No1,521 1,110 1,341 No6/1/2025
IBEW Local 357 Pension Plan A
88-6023284-001
GreenGreenNo9,913 10,162 3,460 No5/31/2021
IBEW Local 38 Pension Plan
34-6574238-001
Red as of 4/30/2020
Yellow as of 4/30/2019
Implemented140 158 116 No4/23/2023
IBEW Local 648 Pension Plan
31-6134845-001
Yellow as of 2/28/2020
Yellow as of 2/28/2019
Implemented526 728 2,175 No8/29/2021
IBEW Local 82 Pension Plan
31-6127268-001
Green as of 6/30/2020
Green as of 6/30/2019
No1,373 1,662 1,569 No12/3/2023
Idaho Plumbers and Pipefitters Pension Plan
82-6010346-001
Green as of 5/31/2020
Green as of 5/31/2019
No1,370 1,307 1,247 No3/31/2023
Minnesota Teamsters Construction Division Pension Fund
41-6187751-001
Green as of 11/30/2019
Green as of 11/30/2018
No663 673 740 No4/30/2021
National Automatic Sprinkler Industry Pension Fund
52-6054620-001
RedRedImplemented954 1,074 738 No
3/31/2021- 7/31/2024
National Electrical Benefit Fund
53-0181657-001
GreenGreenNo14,484 12,679 8,468 No
12/31/2021- 8/30/2025
Pension Trust Fund for Operating Engineers
94-6090764-001
YellowYellowImplemented2,680 2,598 2,403 No
6/15/2022- 6/30/2023
Sheet Metal Workers Pension Plan of Southern CA, AZ, and NV
95-6052257-001
YellowYellowImplemented3,255 2,119 1,774 No6/30/2024
Southwest Marine Pension Trust
95-6123404-001
RedRedImplemented170 132 81 No1/31/2024
Other funds30,931 24,512 21,421 
Total contributions$85,444 $72,525 $58,722 
*    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 FundYear Contributions to Plan Exceeded More Than 5 Percent
of Total Contributions (as of December 31 of the Plan's Year-End)
Edison Pension Plan2019 and 2018
IBEW Local 82 Pension Plan2019 and 2018
IBEW Local 124 Pension Trust Fund2019 and 2018
IBEW Local 212 Pension Trust Fund2019 and 2018
IBEW Local 357 Pension Plan A2019 and 2018
IBEW Local 648 Pension Plan2019 and 2018
IBEW Local 683 Pension Fund Pension Plan2019
IBEW Local Union No 226 Open End Pension Fund2019 and 2018
Idaho Plumbers and Pipefitters Pension Plan2019 and 2018
International Union of Operating Engineers Local 701 Pension Trust Fund2019 and 2018
Minnesota Teamsters Construction Division Pension Fund2019 and 2018
Pension and Retirement Plan of Plumbers and Pipefitters Local 5252019 and 2018