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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Net property, plant and equipment | $ 20,529 | $ 20,553 | $ 35,409
Turkey [Member] |  |  |
Net property, plant and equipment | 7 | 8 | 17,979
Texas [Member] |  |  |
Net property, plant and equipment | 3,594 | 3,604 | 9,413
Alabama [Member] |  |  |
Net property, plant and equipment | 8,972 | 8,973 |
New Mexico [Member] |  |  |
Net property, plant and equipment | 7,806 | 7,806 | 7,806
Corporate |  |  |
Net property, plant and equipment | 150 | 162 | 211
Uranium Plant [Member] |  |  |
Net property, plant and equipment | 3,143 | 3,256 | 8,304
Uranium Plant [Member] | Turkey [Member] |  |  |
Net property, plant and equipment |  |  |
Uranium Plant [Member] | Texas [Member] |  |  |
Net property, plant and equipment | 3,143 | 3,256 | 8,304
Uranium Plant [Member] | Alabama [Member] |  |  |
Net property, plant and equipment |  |  |
Uranium Plant [Member] | New Mexico [Member] |  |  |
Net property, plant and equipment |  |  |
Uranium Plant [Member] | Corporate |  |  |
Net property, plant and equipment |  |  |
Mineral Rights and Properties [Member] |  |  |
Net property, plant and equipment | 16,778 | 16,779 | 25,774
Mineral Rights and Properties [Member] | Turkey [Member] |  |  |
Net property, plant and equipment |  |  | 17,968
Mineral Rights and Properties [Member] | Texas [Member] |  |  |
Net property, plant and equipment |  |  |
Mineral Rights and Properties [Member] | Alabama [Member] |  |  |
Net property, plant and equipment | 8,972 | 8,973 |
Mineral Rights and Properties [Member] | New Mexico [Member] |  |  |
Net property, plant and equipment | 7,806 | 7,806 | 7,806
Mineral Rights and Properties [Member] | Corporate |  |  |
Net property, plant and equipment |  |  |
Other Property Plant and Equipment [Member] |  |  |
Net property, plant and equipment | 608 | 518 | 1,331
Other Property Plant and Equipment [Member] | Turkey [Member] |  |  |
Net property, plant and equipment | 7 | 8 | 11
Other Property Plant and Equipment [Member] | Texas [Member] |  |  |
Net property, plant and equipment | 451 | 348 | 1,109
Other Property Plant and Equipment [Member] | Alabama [Member] |  |  |
Net property, plant and equipment |  |  |
Other Property Plant and Equipment [Member] | New Mexico [Member] |  |  |
Net property, plant and equipment |  |  |
Other Property Plant and Equipment [Member] | Corporate |  |  |
Net property, plant and equipment | $ 150 | $ 162 | $ 211

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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