v3.7.0.1
BUSINESS SEGMENTS BUSINESS SEGMENT (Information by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Sales $ 48,332 $ 73,277
Less: Freight costs 8,721 10,332
Warehousing and handling costs 2,770 2,664
Cost of goods sold 35,873 59,777
Lower-of-cost-or-market inventory adjustments 3,824 9,007
Costs associated with abnormal production and other 0 650
Gross Deficit (2,856) (9,153)
Depreciation, depletion and amortization expense [1] 9,323 14,368
Operating Segments | Potash    
Segment Reporting Information [Line Items]    
Sales 27,220 53,695
Less: Freight costs 2,959 6,551
Warehousing and handling costs 1,512 2,154
Cost of goods sold 20,421 47,288
Lower-of-cost-or-market inventory adjustments 0 9,007
Costs associated with abnormal production and other   650
Gross Deficit 2,328 (11,955)
Depreciation, depletion and amortization expense [1] 7,563 12,233
Operating Segments | Trio [Member]    
Segment Reporting Information [Line Items]    
Sales 21,112 19,582
Less: Freight costs 5,762 3,781
Warehousing and handling costs 1,258 510
Cost of goods sold 15,452 12,489
Lower-of-cost-or-market inventory adjustments 3,824 0
Costs associated with abnormal production and other   0
Gross Deficit (5,184) 2,802
Depreciation, depletion and amortization expense [1] 1,699 1,675
Corporate/Other    
Segment Reporting Information [Line Items]    
Sales 0 0
Less: Freight costs 0 0
Warehousing and handling costs 0 0
Cost of goods sold 0 0
Lower-of-cost-or-market inventory adjustments 0 0
Costs associated with abnormal production and other   0
Gross Deficit 0 0
Depreciation, depletion and amortization expense [1] $ 61 $ 460
[1] Depreciation, depletion and amortization incurred for potash and Trio® excludes depreciation, depletion and amortization amounts absorbed in or (relieved from) inventory.