Environmental Matters - Environmental Sites $ in Thousands	1 Months Ended	6 Months Ended
	Jan. 31, 2017 USD ($)	Jun. 30, 2023 USD ($) party property	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Site Contingency [Line Items]
Current Liabilities		$ 22,878	$ 28,902	$ 20,092
Non-Current Liabilities		86,897	89,905	84,752
Gasco/Siltronic Sediments
Site Contingency [Line Items]
Current Liabilities		8,103	9,744	6,144
Non-Current Liabilities		42,120	42,120	40,740
Site Contingency, Environmental Remediation Costs Recognized		50,200
Gasco/Siltronic Sediments | Minimum [Member]
Site Contingency [Line Items]
Environmental Exit Costs, Anticipated Cost		50,200
Gasco/Siltronic Sediments | Maximum [Member]
Site Contingency [Line Items]
Environmental Exit Costs, Anticipated Cost		350,000
Portland Harbor Other [Member]
Site Contingency [Line Items]
Current Liabilities		2,838	2,634	2,313
Non-Current Liabilities		$ 10,143	11,270	8,613
Gasco Uplands [Member]
Site Contingency [Line Items]
Site contingency: number of management pieces		2
Gasco/Siltronic Upland [Member]
Site Contingency [Line Items]
Current Liabilities		$ 11,424	16,067	11,050
Non-Current Liabilities		33,516	35,457	34,352
Front Street [Member]
Site Contingency [Line Items]
Current Liabilities		513	457	585
Non-Current Liabilities		939	879	868
Additional studies and design costs		1,500
Oregon Steel Mills [Member]
Site Contingency [Line Items]
Current Liabilities		0	0	0
Non-Current Liabilities		$ 179	$ 179	$ 179
Portland Harbor [Member]
Site Contingency [Line Items]
Number of potentially responsible parties (more than) | party		100
EPA final feasibility study and proposed remediation plan, clean-up costs, portland harbor	$ 1,050,000
Number of remediation projects | property		2
Portland Harbor [Member] | Minimum [Member]
Site Contingency [Line Items]
Percentage of clean-up costs	(30.00%)
Portland Harbor [Member] | Maximum [Member]
Site Contingency [Line Items]
Percentage of clean-up costs	50.00%
Yakama Nation [Member] | Portland Harbor Other [Member]
Site Contingency [Line Items]
Trustee Council Members - Number of Claimants		1
Site Contingency, Number of Other Third-Party Defendants		29
NRD liability claim yakama nation		$ 300
Number of Amended Complaints Filed		2