v3.19.1

PROPERTY, PLANT, EQUIPMENT AND MINERAL PROPERTIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Line Items] |
Schedule of Property, Plant, Equipment, And Mineral Properties | Property, plant, equipment, and mineral properties, net" were comprised of the following (in thousands):
|  | December 31,
|  | 2018 |  | 2017
Buildings and plant |  | $ | 81,429 |  |  | $ | 79,757 |
Machinery and equipment |  | 241,977 |  |  | 234,861 |
Vehicles |  | 5,669 |  |  | 4,835 |
Office equipment and improvements |  | 13,779 |  |  | 12,637 |
Ponds and land improvements |  | 58,961 |  |  | 56,194 |
Total depreciable assets |  | 401,815 |  |  | 388,284 |
Accumulated depreciation |  | $ | (167,168 | ) |  | $ | (141,818 | )
Total depreciable assets, net |  | $ | 234,647 |  |  | $ | 246,466 |
Mineral properties and development costs |  | 139,418 |  |  | 138,841 |
Accumulated depletion |  | (31,197 | ) |  | (26,840 | )
Total depletable assets, net |  | 108,221 |  |  | 112,001 |
Land |  | $ | 519 |  |  | $ | 519 |
Construction in progress |  | 2,822 |  |  | 5,556 |
Total property, plant, equipment, and mineral properties, net |  | $ | 346,209 |  |  | $ | 364,542 |
Schedule of Depreciation, Depletion Amortization and Accretion | We incurred the following expenses for depreciation and depletion, including expenses capitalized into inventory, for the following periods (in thousands):
|  | Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Depreciation |  | $ | 27,858 |  |  | $ | 28,323 |  |  | $ | 36,169 |
Depletion |  | 4,357 |  |  | 4,886 |  |  | 4,744 |
Total incurred |  | $ | 32,215 |  |  | $ | 33,209 |  |  | $ | 40,913 |

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- Definition Tabular disclosure of the aggregate expense recognized during the period that allocates the cost of tangible, intangible or depleting assets to periods that benefit from use of the assets. + References No definition available. + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + 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(13)) -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 + Details
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