|
DEBT (Narrative) (Details) (USD $)
|
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
|
|
| Debt | |||
| Long-term Line of Credit | $ 0us-gaap_LineOfCredit | $ 0us-gaap_LineOfCredit | |
| Line of Credit Facility, Current Borrowing Capacity | 250,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity | ||
| Debt Instrument, Face Amount | 150,000,000us-gaap_DebtInstrumentFaceAmount | 150,000,000us-gaap_DebtInstrumentFaceAmount | |
| Proceeds from Notes Payable | 149,300,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts | ||
| Interest Costs Incurred | 1,700,000us-gaap_InterestCostsIncurred | 1,700,000us-gaap_InterestCostsIncurred | |
| Capitalized Interest | 0us-gaap_InterestCostsCapitalized | 300,000us-gaap_InterestCostsCapitalized | |
| Series A Senior Notes | |||
| Debt | |||
| Debt Instrument, Face Amount | 60,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipi_SeriesaseniornotesMember |
60,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipi_SeriesaseniornotesMember |
|
| Debt Instrument, Interest Rate, Stated Percentage | 3.23%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipi_SeriesaseniornotesMember |
3.23%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipi_SeriesaseniornotesMember |
|
| Series B Senior Notes | |||
| Debt | |||
| Debt Instrument, Face Amount | 45,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipi_SeriesbseniornotesMember |
45,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipi_SeriesbseniornotesMember |
|
| Debt Instrument, Interest Rate, Stated Percentage | 4.13%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipi_SeriesbseniornotesMember |
4.13%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipi_SeriesbseniornotesMember |
|
| Series C Senior Notes | |||
| Debt | |||
| Debt Instrument, Face Amount | 45,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipi_SeriescseniornotesMember |
45,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipi_SeriescseniornotesMember |
|
| Debt Instrument, Interest Rate, Stated Percentage | 4.28%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipi_SeriescseniornotesMember |
4.28%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipi_SeriescseniornotesMember |
|
| Unsecured credit facility | |||
| Debt | |||
| Line of Credit Facility, Maximum Borrowing Capacity | 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipi_ExistingCreditFacilityMember |
250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipi_ExistingCreditFacilityMember |
|
| Maximum allowable leverage ratio | 3.5 | ||
| Minimum allowable fixed charge coverage ratio | 1.3 | ||
| Line of Credit Facility, Borrowings | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = ipi_ExistingCreditFacilityMember |
17,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = ipi_ExistingCreditFacilityMember |
|
| Line of Credit Facility, Repayments | $ 0us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = ipi_ExistingCreditFacilityMember |
$ 17,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = ipi_ExistingCreditFacilityMember |
|
| X | ||||||||||
|
- Definition
Represents the maximum ratio of adjusted earnings before income taxes, depreciation and amortization to fixed charges under the financial covenants of the senior credit facility. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the maximum ratio of outstanding principal balance of debt to adjusted earnings before income taxes, depreciation and amortization under the financial covenants of the senior credit facility. No definition available.
|
| X | ||||||||||
|
- Definition
Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total interest costs incurred during the period and either capitalized or charged against earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|