v3.19.1
PROPERTY, PLANT, EQUIPMENT AND MINERAL PROPERTIES (Schedule of Depreciation, Depletion, and Accretion) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation $ 27,858 $ 28,323 $ 36,169
Depletion 4,357 4,886 4,744
Total [1] $ 32,215 $ 33,209 $ 40,913
[1] Depreciation and depletion incurred for potash and Trio® excludes depreciation and depletion absorbed in or (relieved from) inventory.