v3.7.0.1

PROPERTY, PLANT, EQUIPMENT, AND MINERAL PROPERTIES (Schedule of Property, Plant, Equipment, and Mineral Properties) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, plant, equipment, and mineral properties
Depreciable assets	$ 377,333	$ 385,173
Accumulated depreciation	(121,559)	(116,194)
Depreciable assets, net	255,774	268,979
Mineral properties and development costs	138,785	138,578
Accumulated depletion	(23,742)	(21,974)
Total depletable assets, net	115,043	116,604
Land	519	719
Construction in progress	2,957	2,188
Total property, plant, equipment and mineral properties, net	374,293	388,490
Buildings Plant
Property, plant, equipment, and mineral properties
Depreciable assets	79,432	82,457
Machinery and Equipment
Property, plant, equipment, and mineral properties
Depreciable assets	225,570	227,987
Vehicles
Property, plant, equipment, and mineral properties
Depreciable assets	4,743	4,750
Office Equipment and Improvements
Property, plant, equipment, and mineral properties
Depreciable assets	12,598	12,505
Ponds and Land Improvements
Property, plant, equipment, and mineral properties
Depreciable assets	$ 54,990	$ 57,474

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Mineral properties and development costs which include acquisition costs, the cost of drilling wells, and the cost of other development work, net of depletion.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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