v3.19.1

PROPERTY, PLANT, EQUIPMENT AND MINERAL PROPERTIES | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT, EQUIPMENT AND MINERAL PROPERTIES | 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 |
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 The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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