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Note 13 - Property and Equipment, Net - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Property and equipment, gross	$ 1,481,468	$ 1,459,485	$ 1,446,782
Less: accumulated depreciation and depletion	941,415	917,188	888,404
Property and equipment, net	540,053	542,297	558,378
Equipment and Vehicles [Member]
Property and equipment, gross	959,083	947,687	943,456
Mining Properties and Mineral Rights [Member]
Property and equipment, gross	196,033	188,960	191,972
Land and Land Improvements [Member]
Property and equipment, gross	135,707	132,531	135,411
Building and Building Improvements [Member]
Property and equipment, gross	121,387	122,316	109,356
Furniture and Fixtures [Member]
Property and equipment, gross	$ 69,258	$ 67,991	$ 66,587

X

- Definition

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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