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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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Dec. 31, 2014
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| ASSETS | ||
| Cash and cash equivalents | $ 66,786us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 67,589us-gaap_CashAndCashEquivalentsAtCarryingValue |
| Short-term investments | 34,310us-gaap_ShortTermInvestments | 10,434us-gaap_ShortTermInvestments |
| Accounts receivable: | ||
| Trade, net | 38,516us-gaap_AccountsReceivableNetCurrent | 28,561us-gaap_AccountsReceivableNetCurrent |
| Other receivables | 3,280us-gaap_OtherReceivablesNetCurrent | 3,600us-gaap_OtherReceivablesNetCurrent |
| Refundable income taxes | 72us-gaap_IncomeTaxesReceivable | 114us-gaap_IncomeTaxesReceivable |
| Inventory, net | 74,446us-gaap_InventoryNet | 84,094us-gaap_InventoryNet |
| Prepaid expenses and other current assets | 4,087us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 4,739us-gaap_PrepaidExpenseAndOtherAssetsCurrent |
| Current deferred tax asset | 280us-gaap_DeferredTaxAssetsNetCurrent | 3,356us-gaap_DeferredTaxAssetsNetCurrent |
| Total current assets | 221,777us-gaap_AssetsCurrent | 202,487us-gaap_AssetsCurrent |
| Property, plant, equipment, and mineral properties, net | 770,188ipi_PropertyPlantEquipmentandMineralPropertiesNet | 785,250ipi_PropertyPlantEquipmentandMineralPropertiesNet |
| Long-term parts inventory, net | 17,700ipi_LongTermPartsInventoryNoncurrent | 16,366ipi_LongTermPartsInventoryNoncurrent |
| Long-term investments | 11,546us-gaap_LongTermInvestments | 11,856us-gaap_LongTermInvestments |
| Other assets, net | 3,922us-gaap_OtherAssetsNoncurrent | 4,035us-gaap_OtherAssetsNoncurrent |
| Non-current deferred tax asset | 146,838us-gaap_DeferredTaxAssetsNetNoncurrent | 146,725us-gaap_DeferredTaxAssetsNetNoncurrent |
| Total Assets | 1,171,971us-gaap_Assets | 1,166,719us-gaap_Assets |
| Accounts payable: | ||
| Trade | 17,032us-gaap_AccountsPayableTradeCurrent | 19,953us-gaap_AccountsPayableTradeCurrent |
| Related parties | 69us-gaap_AccountsPayableRelatedPartiesCurrent | 55us-gaap_AccountsPayableRelatedPartiesCurrent |
| Accrued liabilities | 15,628us-gaap_AccruedLiabilitiesCurrent | 12,483us-gaap_AccruedLiabilitiesCurrent |
| Accrued employee compensation and benefits | 10,187us-gaap_EmployeeRelatedLiabilitiesCurrent | 12,069us-gaap_EmployeeRelatedLiabilitiesCurrent |
| Other current liabilities | 2,063us-gaap_OtherLiabilitiesCurrent | 2,075us-gaap_OtherLiabilitiesCurrent |
| Total current liabilities | 44,979us-gaap_LiabilitiesCurrent | 46,635us-gaap_LiabilitiesCurrent |
| Long-term debt | 150,000us-gaap_LongTermDebtNoncurrent | 150,000us-gaap_LongTermDebtNoncurrent |
| Asset retirement obligation | 20,813us-gaap_AssetRetirementObligationsNoncurrent | 20,389us-gaap_AssetRetirementObligationsNoncurrent |
| Other non-current liabilities | 2,330us-gaap_OtherLiabilitiesNoncurrent | 2,410us-gaap_OtherLiabilitiesNoncurrent |
| Total Liabilities | 218,122us-gaap_Liabilities | 219,434us-gaap_Liabilities |
| Common stock, $0.001 par value; 100,000,000 shares authorized; and 75,528,235 and 75,405,410 shares outstanding at September, 30, 2014, and December 31, 2013, respectively | 76us-gaap_CommonStockValue | 76us-gaap_CommonStockValue |
| Additional paid-in capital | 576,211us-gaap_AdditionalPaidInCapitalCommonStock | 576,186us-gaap_AdditionalPaidInCapitalCommonStock |
| Accumulated other comprehensive income (loss) | (18)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (28)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
| Retained earnings | 377,580us-gaap_RetainedEarningsAccumulatedDeficit | 371,051us-gaap_RetainedEarningsAccumulatedDeficit |
| Total Stockholders' Equity | 953,849us-gaap_StockholdersEquity | 947,285us-gaap_StockholdersEquity |
| Total Liabilities and Stockholders' Equity | $ 1,171,971us-gaap_LiabilitiesAndStockholdersEquity | $ 1,166,719us-gaap_LiabilitiesAndStockholdersEquity |
| 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
Property, plant, equipment, and mineral properties, net of accumulated depreciation and depletion. Examples include, but are not limited to, buildings and plant, machinery and equipment, vehicles, office equipment, land, and mineral properties and development costs (which include acquisition costs, the cost of drilling wells, and the cost of other development work). No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized 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
Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal 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 due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. 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
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The carrying amount of other receivables, net, due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed. No definition available.
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| X | ||||||||||
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- Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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