Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Supplemental Cash Flow Information [Abstract]
Accrued Salaries, Current		$ 24,939	$ 31,151
Flow-through share premium received (including over-allotment)		223	853
Deferred Revenue	[1]	737	42,863
Accrued Income Taxes, Current		23,529	36,490
Royalty settlement	[2]	0	3,750
Fresnillo deferred cash payment		9,821	9,644
Other Accrued Liabilities		6,090	6,577
Unrealized Gain (Loss) on Derivatives		89	70
Accrual for Taxes Other than Income Taxes, Current		6,066	5,491
Interest Payable, Current		3,775	8,122
Operating Lease, Liability, Current		11,969	11,598
Accrued liabilities and other		$ 87,238	$ 156,609

[1] See Note 17 -- Commitments and Contingencies for additional details on deferred revenue liabilities.

[2] See Note 17 -- Commitments and Contingencies for additional details on the Kensington royalty settlement