Contingencies - Schedule of Contingencies Reserve Balance (Details) - New Idria Mercury Mine [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Loss Contingencies [Line Items]
Beginning reserve balance		$ 13,182	[1]	$ 11,855	[1]	$ 8,213
Changes in estimated environmental liability		3,100		6,500		4,400
Payments made	[2],[3]	(3,857)		(5,173)		(758)
Ending reserve balance	[1]	12,425		13,182		11,855
Beginning receivable balance		7,245	[4]	6,000	[4]	0
Changes in estimated insurance recovery		3,300		3,300		6,000
Insurance recovery reimbursements		(2,141)		(2,055)		0
Ending receivable balance	[4]	$ 8,404		$ 7,245		$ 6,000

[1] (2) As of December 31, 2024, Buckhorn has a total ending reserve balance of $12.4 million related to the New Idria Mine, of which $6.5 million is classified in Other current liabilities and $5.9 million in Other liabilities (long-term).

[2] (4) Payments made for the year ended December 31, 2023 include a $1.9 million payment related to a settlement agreement with the EPA to resolve the past costs claim, which Buckhorn paid in the first quarter of 2023.

[3] (1) Payments made in the years ended December 31, 2022 were offset by insurance refunds of $0.8 million. In the fourth quarter of 2022, Buckhorn reached an agreement with respect to certain insurance coverage related to defense costs for which recovery of accrued costs are recorded as a receivable to the extent such recovery is determined to be probable under this agreement.

[4] (3) As of December 31, 2024, Buckhorn has a total receivable balance related to the probable insurance recovery of $8.4 million, of which $3.9 million is classified in Other accounts receivable and $4.5 million is classified in Other (long-term).