Property, Plant and Mine Development (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment
Property, plant and mine development, gross	$ 2,224,197	$ 2,326,126
Accumulated depletion, depreciation, amortization and impairment charges	(706,610)	(499,823)
Total property, plant and mine development, net	1,517,587	1,826,303
Mining property and mine development
Property, Plant and Equipment
Property, plant and mine development, gross	794,899	995,759
Asset retirement cost
Property, Plant and Equipment
Property, plant and mine development, gross	18,260	12,732
Land
Property, Plant and Equipment
Property, plant and mine development, gross	57,082	55,502
Land improvements
Property, Plant and Equipment
Property, plant and mine development, gross	73,203	67,729
Buildings
Property, Plant and Equipment
Property, plant and mine development, gross	69,112	64,515
Machinery and equipment
Property, Plant and Equipment
Property, plant and mine development, gross	1,152,898	958,357
Furniture and fixtures
Property, Plant and Equipment
Property, plant and mine development, gross	4,068	3,599
Construction-in-progress
Property, Plant and Equipment
Property, plant and mine development, gross	$ 54,675	$ 167,933

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- Definition

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.

+ References

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