v2.3.0.15

DEBT (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Aug. 31, 2011 Y	Sep. 30, 2011 facility quarter Y segment
DEBT
Maximum borrowing capacity	$ 250	$ 125
Term of revolving credit facility (in years)	5
Debt
Number of quarters providing base to compute the ratio of total funded indebtedness to adjusted earnings		4
Commitment fee on the outstanding portion of the unused revolving credit facility amount, low end of range (as a percent)		0.20%
Commitment fee on the outstanding portion of the unused revolving credit facility amount, high end of range (as a percent)		0.35%
LIBOR
Debt
Margin, low end of range		1.25%
Margin, high end of range		2.00%
Alternative base rate
Debt
Margin, low end of range		0.25%
Margin, high end of range		1.00%

X

- Definition

Represents the high end of the range of the percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ Details

Name:	ipi_DebtInstrumentBasisSpreadOnVariableRateHighEndOfRange
Namespace Prefix:	ipi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the low end of the range of the percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ Details

Name:	ipi_DebtInstrumentBasisSpreadOnVariableRateLowEndOfRange
Namespace Prefix:	ipi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for which consolidated leverage ratio which is computed based on ratio of consolidated total funded debt to its consolidated earnings before interest, taxes, depreciation and amortization required to be maintained under financial covenants.

+ Details

Name:	ipi_DebtInstrumentCovenantComplianceConsolidatedLeverageRatioComputedBasedOnConsolidatedFundedDebtToConsolidatedEarningsBeforeInterestConsecutiveQuartersNumber
Namespace Prefix:	ipi
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the high end of the range of the fee, expressed as a percentage of the line of credit facility, regardless of whether the facility has been used.

+ Details

Name:	ipi_LineOfCreditFacilityCommitmentFeePercentageHighEndOfRange
Namespace Prefix:	ipi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the low end of the range of the fee, expressed as a percentage, regardless of whether the facility has been used.

+ Details

Name:	ipi_LineOfCreditFacilityCommitmentFeePercentageLowEndOfRange
Namespace Prefix:	ipi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the expected term of the debt instrument.

+ Details

Name:	ipi_LineOfCreditFacilityMaximumBorrowingCapacityTerm
Namespace Prefix:	ipi
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant