Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		Jun. 30, 2026	Dec. 31, 2025
Supplemental Cash Flow Information [Abstract]
Accrued salaries and wages		$ 58,154	$ 42,354
Deferred revenue	[1]	736	683
Income and mining taxes		91,239	116,230
Deferred cash due 2026	[2]	5,000	4,829
Accrued operating costs		12,296	12,506
Unrealized losses on derivatives		1,350	124
Taxes other than income and mining		12,001	17,465
Accrued interest payable		13,225	6,060
Operating lease liabilities		7,865	11,962
Accrued liabilities and other		$ 201,866	$ 212,213

[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. Payment provided in July 2026 to satisfy the contractual obligation