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INVENTORY AND LONG-TERM PARTS INVENTORY (Summary of Inventory) (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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Dec. 31, 2014
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| Inventory Disclosure [Abstract] | ||
| Finished goods product inventory, net | $ 39,013us-gaap_InventoryFinishedGoods | $ 44,137us-gaap_InventoryFinishedGoods |
| In-process mineral inventory | 14,799us-gaap_InventoryWorkInProcess | 19,584us-gaap_InventoryWorkInProcess |
| Total product inventory, net | 53,812ipi_TotalProductInventory | 63,721ipi_TotalProductInventory |
| Current parts inventory | 20,634us-gaap_InventoryPartsAndComponentsNetOfReserves | 20,373us-gaap_InventoryPartsAndComponentsNetOfReserves |
| Total current inventory, net | 74,446us-gaap_InventoryNet | 84,094us-gaap_InventoryNet |
| Long-term parts inventory | 17,700ipi_LongTermPartsInventoryNoncurrent | 16,366ipi_LongTermPartsInventoryNoncurrent |
| Total inventory, net | $ 92,146ipi_InventoryCurrentAndNoncurrentNet | $ 100,460ipi_InventoryCurrentAndNoncurrentNet |
| X | ||||||||||
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- Definition
Including current and noncurrent portions, aggregate carrying amount of inventories, less all valuation and other allowances, as of the balance sheet date. No definition available.
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| X | ||||||||||
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- Definition
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of parts inventory, including critical spares, that is not expected to be utilized within a period of one year. No definition available.
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| X | ||||||||||
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- Definition
Carrying amount (lower of cost or market) as of the balance sheet date of product inventories less all valuation and other allowances. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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