Note 13 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments - Major Components of Property, Plants, Equipment and Mineral Interests (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment, Gross	$ 4,315,736	$ 3,909,019
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,745,946	1,598,209
Net carrying value	2,569,790	2,310,810
Mining properties, including asset retirement obligations
Property, Plant and Equipment, Gross	871,027	818,582
Development costs
Property, Plant and Equipment, Gross	588,298	549,666
Plants and equipment
Property, Plant and Equipment, Gross	1,514,906	1,446,183
Land
Property, Plant and Equipment, Gross	35,644	34,931
Mineral interests
Property, Plant and Equipment, Gross	1,171,261	972,754
Construction in progress
Property, Plant and Equipment, Gross	$ 134,600	$ 86,903

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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