Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common stock	Other paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury Stock, Common
Common stock balance (in shares) at Dec. 31, 2021		203,889,661
Balance at Dec. 31, 2021	$ 3,382,874	$ 203,889	$ 1,461,205	$ 1,762,410	$ (41,004)	$ (3,626)
Treasury Stock, Common, Shares at Dec. 31, 2021						(538,921)
Net income	31,763			31,763
Other comprehensive income	269				269
Dividends declared on common stock	(44,447)			(44,447)
Stock-based compensation	2,689		2,689
Repurchase of common stock						(266,821)
Repurchase of common stock	(7,399)					$ (7,399)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings			(12,303)
Treasury Stock, Shares, Retired						266,821
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings						$ 7,399
Tax withholding on stock-based compensation	(4,904)
Issuance of common stock	(127)		(127)
Common stock balance (in shares) at Mar. 31, 2022		203,889,661
Balance at Mar. 31, 2022	3,360,718	$ 203,889	1,451,464	1,749,726	(40,735)	$ (3,626)
Treasury Stock, Common, Shares at Mar. 31, 2022						(538,921)
Common stock balance (in shares) at Dec. 31, 2021		203,889,661
Balance at Dec. 31, 2021	3,382,874	$ 203,889	1,461,205	1,762,410	(41,004)	$ (3,626)
Treasury Stock, Common, Shares at Dec. 31, 2021						(538,921)
Net income	250,401
Other comprehensive income	(2,242)
Tax withholding on stock-based compensation	$ (4,904)
Common stock balance (in shares) at Sep. 30, 2022	203,889,661	203,889,661
Balance at Sep. 30, 2022	$ 3,491,858	$ 203,889	1,455,241	1,879,600	(43,246)	$ (3,626)
Treasury Stock, Common, Shares at Sep. 30, 2022	538,921					(538,921)
Common stock balance (in shares) at Mar. 31, 2022		203,889,661
Balance at Mar. 31, 2022	$ 3,360,718	$ 203,889	1,451,464	1,749,726	(40,735)	$ (3,626)
Treasury Stock, Common, Shares at Mar. 31, 2022						(538,921)
Net income	70,667			70,667
Other comprehensive income	(2,796)				(2,796)
Dividends declared on common stock	(44,446)			(44,446)
Stock-based compensation	2,689		2,689
Issuance of common stock	(22)		(22)
Common stock balance (in shares) at Jun. 30, 2022		203,889,661
Balance at Jun. 30, 2022	3,386,810	$ 203,889	1,454,131	1,775,947	(43,531)	$ (3,626)
Treasury Stock, Common, Shares at Jun. 30, 2022						(538,921)
Net income	147,971			147,971
Other comprehensive income	285				285
Dividends declared on common stock	(44,318)			(44,318)
Stock-based compensation	$ 1,110		1,110
Common stock balance (in shares) at Sep. 30, 2022	203,889,661	203,889,661
Balance at Sep. 30, 2022	$ 3,491,858	$ 203,889	1,455,241	1,879,600	(43,246)	$ (3,626)
Treasury Stock, Common, Shares at Sep. 30, 2022	538,921					(538,921)
Common stock balance (in shares) at Dec. 31, 2022	204,162,814	204,162,814
Balance at Dec. 31, 2022	$ 3,587,129	$ 204,163	1,466,037	1,951,138	(30,583)	$ (3,626)
Treasury Stock, Common, Shares at Dec. 31, 2022	538,921					(538,921)
Net income	$ 38,353			38,353
Other comprehensive income	217				217
Dividends declared on common stock	(45,574)			(45,574)
Stock-based compensation	3,108		3,108
Repurchase of common stock						(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			(7,851)
Treasury Stock, Shares, Retired						153,622
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings						$ 4,811
Tax withholding on stock-based compensation	(3,040)
Common stock balance (in shares) at Mar. 31, 2023		204,162,814
Balance at Mar. 31, 2023	$ 3,575,382	$ 204,163	1,461,294	1,943,917	(30,366)	$ (3,626)
Treasury Stock, Common, Shares at Mar. 31, 2023						(538,921)
Common stock balance (in shares) at Dec. 31, 2022	204,162,814	204,162,814
Balance at Dec. 31, 2022	$ 3,587,129	$ 204,163	1,466,037	1,951,138	(30,583)	$ (3,626)
Treasury Stock, Common, Shares at Dec. 31, 2022	538,921					(538,921)
Net income	$ 243,974
Other comprehensive income	$ 518
Treasury Stock, Shares, Retired	538,921
Tax withholding on stock-based compensation	$ (3,040)
Common stock balance (in shares) at Sep. 30, 2023	203,638,373	203,638,373
Balance at Sep. 30, 2023	$ 2,757,434	$ 203,638	1,462,939	1,108,616	(17,759)	$ 0
Treasury Stock, Common, Shares at Sep. 30, 2023						0
Common stock balance (in shares) at Mar. 31, 2023		204,162,814
Balance at Mar. 31, 2023	3,575,382	$ 204,163	1,461,294	1,943,917	(30,366)	$ (3,626)
Treasury Stock, Common, Shares at Mar. 31, 2023						(538,921)
Net income	130,692			130,692
Other comprehensive income	363				363
Dividends declared on common stock	(45,158)			(45,158)
Stock-based compensation	(927)		(927)
Separation of Knife River, Treasury Stock Retirement						538,921
Separation of Knife River	$ (954,541)	(539)		969,934	12,306	$ 3,626
Issuance of common stock (shares)	14,480
Stock Issued		$ 14
Issuance of common stock	$ 382		368
Common stock balance (in shares) at Jun. 30, 2023		203,638,373
Balance at Jun. 30, 2023	2,706,193	$ 203,638	1,460,735	1,059,517	(17,697)	$ 0
Treasury Stock, Common, Shares at Jun. 30, 2023						0
Net income	74,929			74,929
Other comprehensive income	(62)				(62)
Dividends declared on common stock	(25,645)			(25,645)
Stock-based compensation	$ 2,204		2,204
Treasury Stock, Shares, Retired	538,921
Separation of Knife River	$ (185)			185
Common stock balance (in shares) at Sep. 30, 2023	203,638,373	203,638,373
Balance at Sep. 30, 2023	$ 2,757,434	$ 203,638	$ 1,462,939	$ 1,108,616	$ (17,759)	$ 0
Treasury Stock, Common, Shares at Sep. 30, 2023						0