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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff Knife River Corporation | Common Stock | Common Stock Discontinued Operations, Disposed of by Means Other than Sale, Spinoff Knife River Corporation | Other Paid-in Capital | Retained Earnings | Retained Earnings Discontinued Operations, Disposed of by Means Other than Sale, Spinoff Knife River Corporation | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Discontinued Operations, Disposed of by Means Other than Sale, Spinoff Knife River Corporation | Treasury Stock | Treasury Stock Discontinued Operations, Disposed of by Means Other than Sale, Spinoff Knife River Corporation
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Common stock, beginning balance (in shares) at Dec. 31, 2022 |  |  | 204,162,814 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 3,587,129 |  | $ 204,163 |  | $ 1,466,037 | $ 1,951,138 |  | $ (30,583) |  | $ (3,626) |
Treasury stock, common, beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  | (538,921) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 38,353 |  |  |  |  | 38,353 |  |  |  |  |
Other comprehensive income (loss) | 217 |  |  |  |  |  |  | 217 |  |  |
Dividends declared on common stock | (45,574) |  |  |  |  | (45,574) |  |  |  |  |
Stock-based compensation | 3,108 |  |  |  | 3,108 |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  | (153,622) |
Repurchase of common stock | (4,811) |  |  |  |  |  |  |  |  | $ (4,811) |
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings (in shares) |  |  |  |  |  |  |  |  |  | 153,622 |
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings | (3,040) |  |  |  | (7,851) |  |  |  |  | $ 4,811 |
Common stock, ending balance (in shares) at Mar. 31, 2023 |  |  | 204,162,814 |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2023 | 3,575,382 |  | $ 204,163 |  | 1,461,294 | 1,943,917 |  | (30,366) |  | $ (3,626) |
Treasury stock, common, ending balance (in shares) at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  | (538,921) |
Common stock, beginning balance (in shares) at Dec. 31, 2022 |  |  | 204,162,814 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2022 | 3,587,129 |  | $ 204,163 |  | 1,466,037 | 1,951,138 |  | (30,583) |  | $ (3,626) |
Treasury stock, common, beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  | (538,921) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 243,974 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | $ 518 |  |  |  |  |  |  |  |  |  |
Common stock, ending balance (in shares) at Sep. 30, 2023 | 203,638,373 |  | 203,638,373 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2023 | $ 2,757,434 |  | $ 203,638 |  | 1,462,939 | 1,108,616 |  | (17,759) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Sep. 30, 2023 |  |  |  |  |  |  |  |  |  | 0 |
Common stock, beginning balance (in shares) at Mar. 31, 2023 |  |  | 204,162,814 |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2023 | 3,575,382 |  | $ 204,163 |  | 1,461,294 | 1,943,917 |  | (30,366) |  | $ (3,626) |
Treasury stock, common, beginning balance (in shares) at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  | (538,921) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 130,692 |  |  |  |  | 130,692 |  |  |  |  |
Other comprehensive income (loss) | 363 |  |  |  |  |  |  | 363 |  |  |
Dividends declared on common stock | (45,158) |  |  |  |  | (45,158) |  |  |  |  |
Stock-based compensation | $ (927) |  |  |  | (927) |  |  |  |  |  |
Separation of Knife River (in shares) |  |  |  | 538,921 |  |  |  |  |  |  | 538,921
Separation of Knife River |  | $ (954,541) |  | $ (539) |  |  | $ (969,934) |  | $ 12,306 |  | $ 3,626
Issuance of common stock (in shares) | 14,480 |  |  |  |  |  |  |  |  |  |
Costs of issuance of common stock | $ 382 |  | $ 14 |  | 368 |  |  |  |  |  |
Common stock, ending balance (in shares) at Jun. 30, 2023 |  |  | 203,638,373 |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2023 | 2,706,193 |  | $ 203,638 |  | 1,460,735 | 1,059,517 |  | (17,697) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 74,929 |  |  |  |  | 74,929 |  |  |  |  |
Other comprehensive income (loss) | (62) |  |  |  |  |  |  | (62) |  |  |
Dividends declared on common stock | (25,645) |  |  |  |  | (25,645) |  |  |  |  |
Stock-based compensation | $ 2,204 |  |  |  | 2,204 |  |  |  |  |  |
Separation of Knife River |  | $ (185) |  |  |  |  | $ (185) |  |  |  |
Common stock, ending balance (in shares) at Sep. 30, 2023 | 203,638,373 |  | 203,638,373 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2023 | $ 2,757,434 |  | $ 203,638 |  | 1,462,939 | 1,108,616 |  | (17,759) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Sep. 30, 2023 |  |  |  |  |  |  |  |  |  | 0 |
Common stock, beginning balance (in shares) at Dec. 31, 2023 | 203,689,090 |  | 203,689,090 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2023 | $ 2,905,233 |  | $ 203,689 |  | 1,466,235 | 1,253,693 |  | (18,384) |  | $ 0 |
Treasury stock, common, beginning balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 100,898 |  |  |  |  | 100,898 |  |  |  |  |
Other comprehensive income (loss) | 74 |  |  |  |  |  |  | 74 |  |  |
Dividends declared on common stock | (25,779) |  |  |  |  | (25,779) |  |  |  |  |
Stock-based compensation | 3,173 |  |  |  | 3,173 |  |  |  |  |  |
Costs of issuance of common stock | (35) |  |  |  | (35) |  |  |  |  |  |
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings (in shares) |  |  | 199,147 |  |  |  |  |  |  |  |
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings | (2,623) |  | $ 199 |  | (2,822) |  |  |  |  |  |
Common stock, ending balance (in shares) at Mar. 31, 2024 |  |  | 203,888,237 |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2024 | $ 2,980,941 |  | $ 203,888 |  | 1,466,551 | 1,328,812 |  | (18,310) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Mar. 31, 2024 |  |  |  |  |  |  |  |  |  | 0 |
Common stock, beginning balance (in shares) at Dec. 31, 2023 | 203,689,090 |  | 203,689,090 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2023 | $ 2,905,233 |  | $ 203,689 |  | 1,466,235 | 1,253,693 |  | (18,384) |  | $ 0 |
Treasury stock, common, beginning balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 225,950 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | $ 497 |  |  |  |  |  |  |  |  |  |
Common stock, ending balance (in shares) at Sep. 30, 2024 | 203,888,237 |  | 203,888,237 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2024 | $ 3,057,985 |  | $ 203,888 |  | 1,470,429 | 1,401,555 |  | (17,887) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Sep. 30, 2024 |  |  |  |  |  |  |  |  |  | 0 |
Common stock, beginning balance (in shares) at Mar. 31, 2024 |  |  | 203,888,237 |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2024 | 2,980,941 |  | $ 203,888 |  | 1,466,551 | 1,328,812 |  | (18,310) |  | $ 0 |
Treasury stock, common, beginning balance (in shares) at Mar. 31, 2024 |  |  |  |  |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 60,436 |  |  |  |  | 60,436 |  |  |  |  |
Other comprehensive income (loss) | 139 |  |  |  |  |  |  | 139 |  |  |
Dividends declared on common stock | (25,644) |  |  |  |  | (25,644) |  |  |  |  |
Stock-based compensation | 1,947 |  |  |  | 1,947 |  |  |  |  |  |
Costs of issuance of common stock | (15) |  |  |  | (15) |  |  |  |  |  |
Common stock, ending balance (in shares) at Jun. 30, 2024 |  |  | 203,888,237 |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2024 | 3,017,804 |  | $ 203,888 |  | 1,468,483 | 1,363,604 |  | (18,171) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Jun. 30, 2024 |  |  |  |  |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 64,615 |  |  |  |  | 64,615 |  |  |  |  |
Other comprehensive income (loss) | 284 |  |  |  |  |  |  | 284 |  |  |
Dividends declared on common stock | (26,664) |  |  |  |  | (26,664) |  |  |  |  |
Stock-based compensation | $ 1,946 |  |  |  | 1,946 |  |  |  |  |  |
Common stock, ending balance (in shares) at Sep. 30, 2024 | 203,888,237 |  | 203,888,237 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2024 | $ 3,057,985 |  | $ 203,888 |  | $ 1,470,429 | $ 1,401,555 |  | $ (17,887) |  | $ 0 |
Treasury stock, common, ending balance (in shares) at Sep. 30, 2024 |  |  |  |  |  |  |  |  |  | 0 |

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