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v3.25.4

Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Stock | Other Paid-In Capital | Retained Earnings | MDU Resources’ Stock Held by Subsidiary | Treasury Stock | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2022 |  | 80,000 |  |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 1,028,589 | $ 800 | $ 549,106 | $ 494,661 | $ (3,626) | $ 0 | $ (12,352)
Common stock held by subsidiary, beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  | (538,921) |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 182,872 |  |  | 182,872 |  |  |
Other comprehensive income (loss) | 1,033 |  |  |  |  |  | 1,033
Stock-based compensation | 2,851 |  | 2,888 | (37) |  |  |
Common stock issued for board of director fees (in shares) |  | 12,192 |  |  |  |  |
Common stock issued for board of director fees | 702 |  | 702 |  |  |  |
Retirement of historical common stock in connection with the Separation (in shares) |  | (80,000) |  |  |  |  |
Retirement of historical common stock in connection with the Separation | 0 | $ (800) | 800 |  |  |  |
Issuance of common stock in connection with the Separation (in shares) |  | 56,997,350 |  |  |  |  |
Issuance of common stock in connection with the Separation | 0 | $ 570 | (570) |  |  |  |
Transfer of MDU Resources stock held by subsidiary (in shares) |  |  |  |  | 538,921 |  |
Transfer of MDU Resources stock held by subsidiary | 3,626 |  |  |  | $ 3,626 |  |
Receipt of treasury stock at historical cost (in shares) |  |  |  |  |  | (431,136) |
Receipt of treasury stock at historical cost | (3,626) |  |  |  |  | $ (3,626) |
Net transfers from Centennial and MDU Resources including Separation adjustments | 62,972 |  | 62,972 |  |  |  |
Net transfers to Centennial pre-Separation | (13,007) |  | (1,385) | (11,622) |  |  |
Ending balance (in shares) at Dec. 31, 2023 |  | 57,009,542 |  |  |  |  |
Ending balance at Dec. 31, 2023 | 1,266,012 | $ 570 | 614,513 | 665,874 | $ 0 | $ (3,626) | (11,319)
Common stock held by subsidiary, ending balance (in shares) at Dec. 31, 2023 |  |  |  |  | 0 |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2023 |  |  |  |  |  | (431,136) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 201,678 |  |  | 201,678 |  |  |
Other comprehensive income (loss) | 2,017 |  |  |  |  |  | 2,017
Stock-based compensation | 8,051 |  | 8,057 | (6) |  |  |
Common stock issued for employee compensation, net of tax withholding (in shares) |  | 31,298 |  |  |  |  |
Common stock issued for employee compensation, net of tax withholding | $ (1,673) |  | (1,673) |  |  |  |
Common stock issued for board of director fees (in shares) |  | 3,001 |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2024 | 56,612,705 | 57,043,841 |  |  |  |  |
Ending balance at Dec. 31, 2024 | $ 1,476,085 | $ 570 | 620,897 | 867,546 | $ 0 | $ (3,626) | (9,302)
Common stock held by subsidiary, ending balance (in shares) at Dec. 31, 2024 |  |  |  |  | 0 |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2024 | (431,136) |  |  |  |  | (431,136) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | $ 157,074 |  |  | 157,074 |  |  |
Other comprehensive income (loss) | (960) |  |  |  |  |  | (960)
Stock-based compensation | 11,394 |  | 11,394 |  |  |  |
Common stock issued for employee compensation, net of tax withholding (in shares) |  | 39,656 |  |  |  |  |
Common stock issued for employee compensation, net of tax withholding | $ (2,653) | $ 1 | (2,654) |  |  |  |
Common stock issued for board of director fees (in shares) |  | 11,804 |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2025 | 56,664,165 | 57,095,301 |  |  |  |  |
Ending balance at Dec. 31, 2025 | $ 1,640,940 | $ 571 | $ 629,637 | $ 1,024,620 | $ 0 | $ (3,626) | $ (10,262)
Common stock held by subsidiary, ending balance (in shares) at Dec. 31, 2025 |  |  |  |  | 0 |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2025 | (431,136) |  |  |  |  | (431,136) |

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