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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Land $ 121,330 $ 116,728
Land improvements 115,693 83,256
Buildings and improvements 354,679 337,728
Machinery and equipment 3,564,389 3,355,519
Mineral rights and reserves 1,780,236 1,764,067
Construction in progress 1,491,314 1,160,545
Total $ 7,427,641 $ 6,817,843