Discontinued Operations (Details - Balance Sheet) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Cash and Cash Equivalents			$ 10,090	$ 16,761
Discontinued Operation, Receivables, Net			241,302	447,882
Discontinued Operation, Inventory, Current			323,277	308,829
Discontinued Operation, Prepaid and Other Assets, Current			17,848	16,949
Discontinued Operation, Assets, Current			592,517	790,421
Discontinued Operation, Property, Plant and Equipment, Net			1,315,213	1,275,649
Discontinued Operation, Goodwill			274,540	274,302
Discontinued Operation, Intangible Assets, Net			13,430	14,097
Discontinued Operation, Long-Term Investments			33,086	32,326
Discontinued Operation, Operating Lease, Right-of-Use Asset			45,872	43,431
Discontinued Operation, Other Assets, Noncurrent			3,610	3,233
Noncurrent assets of discontinued operations	$ 0		1,685,751	1,643,038
Discontinued Operation, Total Assets			2,278,268	2,433,459
Discontinued Operation, Short-Term Debt			208,000	100,000
Discontinued Operation, Long-Term Debt, Current Maturities			30,211	128,133
Discontinued Operation, Accounts Payable			131,608	178,320
Discontinued Operation, Taxes Payable, Current			8,502	12,874
Discontinued Operation, Employee-related Liabilities, Current			29,192	27,383
Discontinued Operation, Operating Lease, Liability, Current			13,210	13,000
Discontinued Operation, Accrued Liabilities, Current			76,200	73,852
Current liabilities of discontinued operations	0		496,923	533,562
Discontinued Operation, Long-Term Debt, Excluding Current Maturities			445,546	581,588
Discontinued Operation, Deferred Income Tax Liabilities, Net			175,804	175,529
Discontinued Operation, Asset Retirement Obligations, Noncurrent			33,015	27,964
Discontinued Operation, Operating Lease Liability, Noncurrent			32,663	30,431
Discontinued Operation, Other Liabilities, Noncurrent			78,876	87,159
Noncurrent liabilities of discontinued operations	0		765,904	902,671
Discontinued Operation, Total Liabilities			$ 1,262,827	$ 1,436,233
Separation of Knife River	$ (185)	$ (954,541)