Environmental Matters - Environmental Sites $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2017 USD ($)	Mar. 31, 2024 USD ($) property party	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)
Site Contingency [Line Items]
Current Liabilities		$ 27,388	$ 32,454	$ 25,187
Non-Current Liabilities		86,071	89,173	89,110
Gasco/Siltronic Sediments
Site Contingency [Line Items]
Current Liabilities		9,989	12,428	8,588
Non-Current Liabilities		41,365	42,550	42,766
Site Contingency, Environmental Remediation Costs Recognized		51,400
Gasco/Siltronic Sediments | Minimum [Member]
Site Contingency [Line Items]
Environmental Exit Costs, Anticipated Cost		51,400
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		2,978	3,035	2,868
Non-Current Liabilities		$ 10,707	11,270	10,707
Gasco Uplands [Member]
Site Contingency [Line Items]
Site contingency: number of management pieces		2
Gasco/Siltronic Upland [Member]
Site Contingency [Line Items]
Current Liabilities		$ 13,875	16,304	13,275
Non-Current Liabilities		33,307	34,235	34,519
Front Street [Member]
Site Contingency [Line Items]
Current Liabilities		546	687	456
Non-Current Liabilities		513	939	939
Additional studies and design costs		1,100
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