Property, Plant and Mine Development (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment
Property, plant and mine development, gross	$ 2,225,737	$ 1,522,675
Accumulated depletion, depreciation and amortization	(400,084)	(353,520)
Total property, plant and mine development, net	1,825,653	1,169,155
Mining property and mine development
Property, Plant and Equipment
Property, plant and mine development, gross	1,051,824	586,242
Asset retirement cost
Property, Plant and Equipment
Property, plant and mine development, gross	14,308	14,184
Land
Property, Plant and Equipment
Property, plant and mine development, gross	42,189	36,552
Land improvements
Property, Plant and Equipment
Property, plant and mine development, gross	66,336	45,878
Buildings
Property, Plant and Equipment
Property, plant and mine development, gross	73,150	56,330
Machinery and equipment
Property, Plant and Equipment
Property, plant and mine development, gross	790,655	590,566
Furniture and fixtures
Property, Plant and Equipment
Property, plant and mine development, gross	4,053	2,953
Construction-in-progress
Property, Plant and Equipment
Property, plant and mine development, gross	$ 183,222	$ 189,970

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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