Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Supplemental Cash Flow Information [Abstract]
Accrued Salaries, Current		$ 37,687	$ 31,151
Flow-through share premium received (including over-allotment)		0	853
Deferred Revenue	[1]	706	42,863
Accrued Income Taxes, Current		69,071	36,490
Royalty settlement	[2]	0	3,750
Fresnillo deferred cash payment		4,746	9,644
Other Accrued Liabilities		14,187	6,577
Unrealized Gain (Loss) on Derivatives		61	70
Accrual for Taxes Other than Income Taxes, Current		13,058	5,491
Interest Payable, Current		2,603	8,122
Operating Lease, Liability, Current		13,069	11,598
Accrued liabilities and other		$ 155,188	$ 156,609

[1] See Note 17 -- Commitments and Contingencies for additional details on deferred revenue liabilities. (2) See Note 12 -- Fair Value Measurements for additional details on Deferred Cash Due 2026.

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