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Note 4 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments - Major Components of Property, Plants, Equipment and Mineral Interests (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property, plant and equipment, gross |  | $ 3,634,861 | $ 2,974,092
Less accumulated depreciation, depletion and amortization |  | 1,114,857 | 974,781
Net carrying value | [1] | 2,520,004 | 1,999,311
Mining Properties Including Asset Retirement Obligations [Member] |  |  |
Property, plant and equipment, gross |  | 533,631 | 404,905
Mine Development [Member] |  |  |
Property, plant and equipment, gross |  | 444,229 | 390,094
Plant and Equipment [Member] |  |  |
Property, plant and equipment, gross |  | 988,285 | 847,462
Land [Member] |  |  |
Property, plant and equipment, gross |  | 32,953 | 26,949
Mineral Interests [Member] |  |  |
Property, plant and equipment, gross |  | 1,269,956 | 957,359
Construction in Progress [Member] |  |  |
Property, plant and equipment, gross |  | $ 365,807 | $ 347,323
[1] | Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.

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