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Note 13 - Property and Equipment, Net - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Property and equipment, gross	$ 1,489,401	$ 1,459,485	$ 1,449,643
Less: accumulated depreciation and depletion	953,145	917,188	906,847
Property and equipment, net	536,256	542,297	542,796
Equipment and Vehicles [Member]
Property and equipment, gross	959,828	947,687	949,577
Mining Properties and Mineral Rights [Member]
Property and equipment, gross	199,677	188,960	185,792
Land and Land Improvements [Member]
Property and equipment, gross	135,102	132,531	134,543
Building and Building Improvements [Member]
Property and equipment, gross	122,119	122,316	112,940
Furniture and Fixtures [Member]
Property and equipment, gross	$ 72,675	$ 67,991	$ 66,791

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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