Summary of Significant Accounting Policies Summary of Unearned Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Oct. 02, 2014
Contract Liabilities
Revenue Recognized	$ 55,562,000	$ 25,468,000	$ 15,887,000
Palmarejo gold production royalty
Contract Liabilities
Aggregate deposit to be received				$ 22,000,000.0
Price per ounce under agreement				$ 800
Production to be sold, percent				50.00%
Franco-Nevada
Contract Liabilities
Opening Balance	6,942,000	7,411,000	8,150,000
Revenue Recognized	(560,000)	(469,000)	(739,000)
Closing Balance	6,382,000	6,942,000	7,411,000
Kensington
Contract Liabilities
Opening Balance	55,082,000	25,016,000
Additions	170,000,000	130,066,000	36,020,000
Revenue Recognized	(182,918,000)	(100,000,000)	(26,020,000)
Closing Balance	$ 42,164,000	$ 55,082,000	$ 25,016,000