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Pay vs Performance Disclosure - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pay vs Performance Disclosure            
Pay vs Performance Disclosure, Table
(a)(b)(b)(c)(c)(d)(e)(f)(g)(h)(i)
Year(1)
CAP to Goodin
($)(3)
CAP to Kivisto
($)(3)
Average SCT Total Compensation for Non-PEO NEOs
($)(4)
Average CAP to Non-PEO NEOs
($)(5)
Value of Initial Fixed $100 Investment Based on:
Net Income
(in thousands)
($)(8)
Company Selected Measure - Adjusted Business Segment Earnings
(in thousands)
($)(9)
SCT Total for PEO
Goodin ($)(2)
Kivisto ($)(2)
Total Stockholder Return
($)(6)
Peer Group Total Stockholder Return
($)(7)
2024
753,667 5,628,905 1,662,433 8,384,701 1,734,826 1,884,371 184.68 151.51 281,108 315,605 
20237,100,593 — 4,987,034 — 2,113,640 1,648,546 110.18 136.68 414,707 288,170 
20225,257,288 — 5,644,274 — 1,901,639 1,998,863 111.98 123.90 367,489 379,149 
20215,210,467 — 7,143,972 — 1,810,584 2,273,834 110.37 128.00 378,131 385,210 
20206,423,410 — 5,664,783 — 2,042,921 1,901,274 91.69 101.04 390,205 394,570 
         
Company Selected Measure Name Adjusted Business Segment Earnings for Incentive Purposes(b)          
Named Executive Officers, Footnote Our PEO for years 2020-23 and part of 2024 was Mr. Goodin. Ms. Kivisto became our PEO upon Mr. Goodin’s retirement. Our non-PEO NEOs were as follows:
2020-22 - Mr. Vollmer, David C. Barney, Mr. Thiede, and Ms. Kivisto;
2023 - Mr. Vollmer, Mr. Thiede, Ms. Kivisto, and Ms. Jones; and
2024 - Mr. Vollmer, Mr. Senger, Ms. Jones, Mr. Johnson, and Mr. Thiede.
         
Peer Group Issuers, Footnote Represents the value of $100 invested in the compensation peer group company stock on December 31, 2019, as of December 31, 2020, December 31, 2021, December 31, 2022, December 31, 2023, and December 31, 2024 assuming dividends are reinvested in the compensation peer group stock at the frequency paid. Returns of each peer group company are weighted according to the peer group company’s market capitalization at the beginning of the period. Our compensation benchmarking peer group companies for 2020, 2021, 2022, 2023, and 2024 included:
2020 and 20212022 and 2023*2024**
Alliant Energy Corporation
Alliant Energy Corporation
Alliant Energy Corporation
Ameren CorporationAmeren CorporationAmeren Corporation
Atmos Energy CorporationAtmos Energy CorporationAPi Group Corporation
Black Hills CorporationBlack Hills CorporationAtmos Energy Corporation
CMS Energy CorporationCMS Energy CorporationAvista Corporation
Dycom Industries, Inc.Dycom Industries, Inc.Black Hills Corporation
EMCOR Group, Inc.EMCOR Group, Inc.CMS Energy Corporation
Evergy, Inc.Evergy, Inc.Comfort Systems USA, Inc.
Granite Construction IncorporatedGranite Construction IncorporatedDycom Industries, Inc.
Jacobs Engineering Group Inc.KBR, Inc.EMCOR Group, Inc.
KBR, Inc.
Martin Marietta Materials Inc.
Evergy, Inc.
Martin Marietta Materials Inc.
MasTec, Inc.KBR, Inc.
MasTec, Inc.
MYR Group Inc.*
MYR Group Inc.
NiSource Inc.NiSource Inc.New Jersey Resources Corporation
Pinnacle West Capital CorporationPinnacle West Capital CorporationNiSource Inc.
Portland General Electric CompanyPortland General Electric CompanyOGE Energy Corp.
Quanta Services, Inc.Quanta Services, Inc.Pinnacle West Capital Corporation
Southwest Gas Holdings, Inc.Southwest Gas Holdings, Inc.Portland General Electric Company
Summit Materials, Inc.Summit Materials, Inc.Primoris Services Corporation
Vulcan Materials CompanyVulcan Materials CompanySouthwest Gas Holdings, Inc.
WEC Energy Group, Inc.WEC Energy Group, Inc.WEC Energy Group, Inc.
*    Jacobs Engineering Group, Inc. was replaced with MYR Group, Inc. in 2022 due to size.
**     Following completion of the Knife River spinoff, the Compensation Committee revised the peer group. Companies associated with the construction materials industry, namely Granite Construction Incorporated, Martin Marietta Materials, Inc., Summit Materials, Inc., and Vulcan Materials Company were removed. Other companies removed due to size were MasTec, Inc. and Quanta Services, Inc. Companies added to the 2024 peer group included APi Group Corporation, Avista Corporation, Comfort Systems USA, Inc., New Jersey Resources Corporation, OGE Energy Corp., and Primoris Services Corporation.
Total stockholder return for the peer group companies were as follows:
12/31/2019
($)
12/31/2020
($)
12/31/2021
($)
12/31/2022
($)
12/31/2023
($)
12/31/2024
($)
2020-22 Peer Group
100.00101.04128.00124.22136.60173.56
2022-23 Peer Group100.00100.01126.85123.90136.68173.59
2024 Peer Group100.00 95.85 113.87 115.76 117.03 151.51 
         
PEO Total Compensation Amount   $ 7,100,593 $ 5,257,288 $ 5,210,467 $ 6,423,410  
PEO Actually Paid Compensation Amount   4,987,034 5,644,274 7,143,972 5,664,783  
Adjustment To PEO Compensation, Footnote To arrive at 2024 CAP for Mr. Goodin and Ms. Kivisto, total compensation as reported in the SCT was adjusted for the following:
Goodin
($)
Kivisto
($)
SCT Total Compensation for the PEO
753,667 5,628,905 
less: Reported Value of Stock Awards in the SCT(a)
339,417 3,162,624 
plus: Equity Award Adjustments(a)(b)
1,248,183 5,918,420 
less: Change in Actuarial Present Value of Defined Benefit and Pension Plans as Reported in the SCT
— — 
plus: Aggregate Service Cost and Prior Service Costs on Defined Benefit and Pension Plans— — 
CAP for the PEO
1,662,433 8,384,701 
(a)    Equity compensation grant date and year-end fair value for RSUs were determined by the closing stock price on the grant date or year-end, as applicable.
(b)    Stock Award Adjustments in determining CAP:
PEO
Year-end Fair Value of Equity Awards Granted in the Year that are Unvested
($)
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that are Unvested
($)
Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year
($)
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year
($)
Prior Year-end Fair Value of Equity Awards that Failed to Meet Vesting Conditions in the Year
($)
Value of Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Fair Value or Total Compensation
($)
Total Equity Award Adjustments
($)
Goodin
— 823,955 — 2,397,278 (1,973,050)— 1,248,183 
Kivisto
4,616,526 666,658 — 635,236 — — 5,918,420 
         
Non-PEO NEO Average Total Compensation Amount $ 1,734,826 2,113,640 1,901,639 1,810,584 2,042,921  
Non-PEO NEO Average Compensation Actually Paid Amount $ 1,884,371 1,648,546 1,998,863 2,273,834 1,901,274  
Adjustment to Non-PEO NEO Compensation Footnote To arrive at the Average 2024 CAP for our non-PEO NEOs, total compensation as reported in the SCT was adjusted for the following:
Average of SCT Total Compensation for Non-PEO NEOs
1,734,826 
less: Reported Value of Stock Awards in the SCT(a)
810,258 
plus: Equity Award Adjustments(a)(b)
959,803 
less: Change in Actuarial Present Value of Defined Benefit and Pension Plans as Reported in the SCT
— 
plus: Aggregate Service Cost and Prior Service Costs on Defined Benefit and Pension Plans— 
Average CAP for the Non-PEO NEOs
1,884,371 
(a)    Equity compensation grant date and year-end fair value for time vesting awards determined by the closing stock price on the grant date or year-end, as applicable.
(b)    Stock Award Adjustments for average non-PEO NEO:
YearYear-end Fair Value of Equity Awards Granted in the Year that are Unvested
($)
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that are Unvested
($)
Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year
($)
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year
($)
Prior Year-end Fair Value of Equity Awards that Failed to Meet Vesting Conditions in the Year
($)
Value of Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Fair Value or Total Compensation
($)
Total Equity Award Adjustments
($)
2024804,885 255,057 — 233,067 (333,206)— 959,803 
         
Compensation Actually Paid vs. Total Shareholder Return
CAP vs. TSR
Our TSR is a reflection of our stock price and dividends paid over a period of time and is important to stockholders as it measures the performance of an investment in our Common Stock in the marketplace. The following chart depicts the PEO and average non-PEO NEO CAP compared to the value of $100 invested in Company and peer company stock on December 31, 2019 as of December 31, 2020, December 31, 2021, December 31, 2022, December 31, 2023, and December 31, 2024, assuming dividends are reinvested at the frequency paid.
3696
         
Compensation Actually Paid vs. Net Income
CAP vs. Net Income
The following chart depicts the PEO and average non-PEO NEO CAP compared to the Company’s net income for 2020, 2021, 2022, 2023, and 2024.
3870
         
Compensation Actually Paid vs. Company Selected Measure
CAP vs. Adjusted Business Segment Earnings
The following chart depicts the PEO and average non-PEO NEO CAP compared to the Company’s Adjusted Business Segment Earnings for 2020, 2021, 2022, 2023, and 2024.
4074
         
Total Shareholder Return Vs Peer Group
CAP vs. TSR
Our TSR is a reflection of our stock price and dividends paid over a period of time and is important to stockholders as it measures the performance of an investment in our Common Stock in the marketplace. The following chart depicts the PEO and average non-PEO NEO CAP compared to the value of $100 invested in Company and peer company stock on December 31, 2019 as of December 31, 2020, December 31, 2021, December 31, 2022, December 31, 2023, and December 31, 2024, assuming dividends are reinvested at the frequency paid.
3696
         
Tabular List, Table
Performance Metrics Most Closely Linked to CAP for 2024 (Unranked)
Adjusted Business Segment Earnings
Adjusted Electric and Natural Gas Distribution Segment Earnings
Adjusted Pipeline Segment Earnings
         
Total Shareholder Return Amount $ 184.68 110.18 111.98 110.37 91.69  
Peer Group Total Shareholder Return Amount 151.51 136.68 123.90 128.00 101.04  
Net Income (Loss) $ 281,108,000 $ 414,707,000 $ 367,489,000 $ 378,131,000 $ 390,205,000  
Company Selected Measure Amount 315,605,000 288,170,000 379,149,000 385,210,000 394,570,000  
PEO Name   Goodin Goodin Goodin Goodin  
Additional 402(v) Disclosure Represents Mr. Goodin’s total compensation as shown in the SCT for the respective years, and Ms. Kivisto’s total compensation for 2024 as shown in the SCT.Represents the average total compensation of our non-PEO NEOs as shown in the SCT for the respective year.Represents value of $100 invested in Company Stock on December 31, 2019, as of December 31, 2020, December 31, 2021, December 31, 2022, December 31, 2023, and December 31, 2024, assuming dividends are reinvested in company stock at the frequency paid.Represents Net Income reported for the Company in 2020, 2021, 2022, 2023, and 2024.    Business segment earnings represent the earnings generated by our business segments, including the Electric and Natural Gas Distribution and Pipeline segments, as well as the Construction Services and Construction Materials and Contracting segments, prior to their spinoffs in 2024 and 2023, respectively. The combined earnings of each of these business segments plus results of activities classified as Other reflect net income as reported in our financial statements as follows:
(shown in thousands)
2024
($)
2023
($)
2022
($)
2021
($)
2020
($)
Electric and Natural Gas Distribution121,730 120,079 102,248 103,502 99,650 
Pipeline68,042 46,918 35,288 40,896 37,012 
Construction Services122,031 137,230 124,781 109,402 109,721 
Construction Materials and Contracting— (18,456)116,220 129,755 147,325 
Business Segment Earnings(a)
311,803 285,771 378,537 383,555 393,708 
Other(30,695)128,936 (11,048)(5,424)(3,503)
Net Income281,108 414,707 367,489 378,131 390,205 
Business Segment Earnings311,803 285,771 378,537 383,555 393,708 
Adjustments approved by the Compensation Committee for Incentive Purposes3,802 2,399 612 1,655 862 
Adjusted Business Segment Earnings for Incentive Purposes(b)
315,605 288,170 379,149 385,210 394,570 
(a)    Business Segment Earnings includes earnings from continuing and discontinued operations associated with each business segment.
(b)    Business Segment Earnings are adjusted for certain events approved by the Compensation Committee.
Descriptions of the Information Presented in the Pay Versus Performance Table
We are providing the following graphics to illustrate the relationship between our PEO CAP and our non-PEO NEOs’ CAP as a group and Company performance, as set forth and described in and under Pay Versus Performance, including the Company’s cumulative TSR, net income, and Adjusted Business Segment Earnings. In addition, we are providing a graphic to illustrate the relationship between the Company’s cumulative TSR and our compensation benchmarking peer group’s cumulative TSR. PEO CAP 1 refers to Mr. Goodin and PEO CAP 2 refers to Ms. Kivisto.
         
Measure:: 1            
Pay vs Performance Disclosure            
Name Adjusted Business Segment Earnings          
Measure:: 2            
Pay vs Performance Disclosure            
Name Adjusted Electric and Natural Gas Distribution Segment Earnings          
Measure:: 3            
Pay vs Performance Disclosure            
Name Adjusted Pipeline Segment Earnings          
Goodin [Member]            
Pay vs Performance Disclosure            
PEO Total Compensation Amount $ 753,667          
PEO Actually Paid Compensation Amount $ 1,662,433          
PEO Name Goodin          
Kivisto [Member]            
Pay vs Performance Disclosure            
PEO Total Compensation Amount $ 5,628,905          
PEO Actually Paid Compensation Amount $ 8,384,701          
PEO Name Kivisto          
2020-2022 Peer Group [Member]            
Pay vs Performance Disclosure            
Peer Group Total Shareholder Return Amount $ 173.56 $ 136.60 $ 124.22 $ 128.00 $ 101.04 $ 100.00
2022-2023 Peer Group [Member]            
Pay vs Performance Disclosure            
Peer Group Total Shareholder Return Amount 173.59 136.68 123.90 126.85 100.01 100.00
2024 Peer Group [Member]            
Pay vs Performance Disclosure            
Peer Group Total Shareholder Return Amount 151.51 $ 117.03 $ 115.76 $ 113.87 $ 95.85 $ 100.00
PEO | Goodin [Member] | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Goodin [Member] | Aggregate Pension Adjustments Service Cost            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Goodin [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount (339,417)          
PEO | Goodin [Member] | Equity Awards Adjustments, Excluding Value Reported in Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 1,248,183          
PEO | Goodin [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Goodin [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 823,955          
PEO | Goodin [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Goodin [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 2,397,278          
PEO | Goodin [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount (1,973,050)          
PEO | Goodin [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Kivisto [Member] | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Kivisto [Member] | Aggregate Pension Adjustments Service Cost            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Kivisto [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount (3,162,624)          
PEO | Kivisto [Member] | Equity Awards Adjustments, Excluding Value Reported in Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 5,918,420          
PEO | Kivisto [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 4,616,526          
PEO | Kivisto [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 666,658          
PEO | Kivisto [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Kivisto [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 635,236          
PEO | Kivisto [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
PEO | Kivisto [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
Non-PEO NEO | Aggregate Pension Adjustments Service Cost            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 810,258          
Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 959,803          
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 804,885          
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 255,057          
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 0          
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount 233,067          
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount (333,206)          
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year            
Pay vs Performance Disclosure            
Adjustment to Compensation, Amount $ 0