Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Supplemental Cash Flow Information [Abstract]
Accrued Salaries, Current		$ 29,815	$ 31,722
Flow-through share premium received (including over-allotment)		1,220	5,563
Deferred Revenue	[1]	55,664	55,547
Accrued Income Taxes, Current		28,731	11,766
Royalty settlement	[1]	3,750	0
Fresnillo deferred cash payment		9,471	0
Other Accrued Liabilities		12,055	11,081
Unrealized Gain (Loss) on Derivatives		142	1,981
Accrual for Taxes Other than Income Taxes, Current		4,740	5,321
Interest Payable, Current		3,373	7,957
Operating Lease, Liability, Current		4,324	9,975
Accrued liabilities and other		$ 153,285	$ 140,913

[1] See Note 16 -- Commitments and Contingencies for additional details on deferred revenue liabilities.