Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Supplemental Cash Flow Information [Abstract]
Accrued Salaries, Current		$ 31,151	$ 31,722
Flow-through share premium received (including over-allotment)		853	5,563
Deferred Revenue	[1]	42,863	55,547
Accrued Income Taxes, Current		36,490	11,766
Royalty settlement	[2]	3,750	0
Fresnillo deferred cash payment		9,644	0
Other Accrued Liabilities		6,577	11,081
Unrealized Gain (Loss) on Derivatives		70	1,981
Accrual for Taxes Other than Income Taxes, Current		5,491	5,321
Interest Payable, Current		8,122	7,957
Operating Lease, Liability, Current		11,598	9,975
Accrued liabilities and other		$ 156,609	$ 140,913

[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