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Note 14 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments - Major Components of Property, Plants, Equipment and Mineral Interests (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Property, plant and equipment, gross | $ 3,909,019 |  | $ 3,824,404 |  |
Less accumulated depreciation, depletion and amortization | 1,598,209 |  | 1,446,330 |  |
Net carrying value | 2,310,810 | [1] | 2,378,074 | [1] | $ 2,447,450
Mining Properties Including Asset Retirement Obligations [Member] |  |  |  |  |
Property, plant and equipment, gross | 818,582 |  | 818,819 |  |
Mine Development [Member] |  |  |  |  |
Property, plant and equipment, gross | 549,666 |  | 526,714 |  |
Plant and Equipment [Member] |  |  |  |  |
Property, plant and equipment, gross | 1,446,183 |  | 1,410,209 |  |
Land [Member] |  |  |  |  |
Property, plant and equipment, gross | 34,931 |  | 32,983 |  |
Mineral Interests [Member] |  |  |  |  |
Property, plant and equipment, gross | 972,754 |  | 969,589 |  |
Construction in Progress [Member] |  |  |  |  |
Property, plant and equipment, gross | $ 86,903 |  | $ 66,090 |  |
[1] | Amounts reported as of and for the years ended December 31, 2020 and 2019 have been revised. See Note 3 for more information.

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