Environmental Matters - Environmental Sites $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2017 USD ($)	Mar. 31, 2023 USD ($) property party	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)
Site Contingency [Line Items]
Current Liabilities		$ 25,187	$ 28,902	$ 22,286
Non-Current Liabilities		89,110	89,905	86,830
Gasco/Siltronic Sediments
Site Contingency [Line Items]
Current Liabilities		8,588	9,744	6,086
Non-Current Liabilities		42,766	42,120	41,408
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		2,868	2,634	2,198
Non-Current Liabilities		$ 10,707	11,270	9,092
Gasco Uplands [Member]
Site Contingency [Line Items]
Site contingency: number of management pieces		2
Gasco/Siltronic Upland [Member]
Site Contingency [Line Items]
Current Liabilities		$ 13,275	16,067	13,203
Non-Current Liabilities		34,519	35,457	35,283
Front Street [Member]
Site Contingency [Line Items]
Current Liabilities		456	457	799
Non-Current Liabilities		939	879	868
Additional studies and design costs		1,400
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