XML 54 R77.htm IDEA: XBRL DOCUMENT v2.4.1.9

Income Taxes Schedule of Deferred Income Tax Components (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Net change in deferred income tax liability per above table	$ 96,146us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Change in tax effects of income tax related regulatory assets and liabilities	(6,538)pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities
Tax effect of mark-to-market adjustments	(1,612)pnm_TaxEffectOfMarkToMarketAdjustments
Tax effect of excess pension liability	3,993pnm_TaxEffectOfExcessPensionLiability
Reclassification of unrecognized tax benefits	(4,858)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Unrecognized Tax Benefits	15,031pnm_Adjustmentforunrecognizedtaxbenefits
Other	381us-gaap_DeferredOtherTaxExpenseBenefit
Deferred income taxes	72,481us-gaap_DeferredIncomeTaxExpenseBenefit	60,430us-gaap_DeferredIncomeTaxExpenseBenefit	56,243us-gaap_DeferredIncomeTaxExpenseBenefit
Public Service Company of New Mexico [Member]
Income Taxes [Line Items]
Net change in deferred income tax liability per above table	70,129us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Change in tax effects of income tax related regulatory assets and liabilities	(6,349)pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Tax effect of mark-to-market adjustments	(1,470)pnm_TaxEffectOfMarkToMarketAdjustments / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Tax effect of excess pension liability	3,993pnm_TaxEffectOfExcessPensionLiability / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Reclassification of unrecognized tax benefits	1,155us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Unrecognized Tax Benefits	12,228pnm_Adjustmentforunrecognizedtaxbenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other	557us-gaap_DeferredOtherTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred income taxes	55,787us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
Income Taxes [Line Items]
Net change in deferred income tax liability per above table	27,851us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Change in tax effects of income tax related regulatory assets and liabilities	(111)pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Reclassification of unrecognized tax benefits	(6,796)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Other	(395)us-gaap_DeferredOtherTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred income taxes	$ 20,549us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

X

- Definition

Adjustment for unrecognized tax benefits

+ References

No definition available.

+ Details

Name:	pnm_Adjustmentforunrecognizedtaxbenefits
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Change in tax effects of income tax related regulatory assets and liabilities

+ References

No definition available.

+ Details

Name:	pnm_ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	pnm_IncomeTaxesLineItems
Namespace Prefix:	pnm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax effect of excess pension liability

+ References

No definition available.

+ Details

Name:	pnm_TaxEffectOfExcessPensionLiability
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Tax effect of mark-to-market adjustments

+ References

No definition available.

+ Details

Name:	pnm_TaxEffectOfMarkToMarketAdjustments
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

Name:	us-gaap_DeferredIncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (g),(h)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

Name:	us-gaap_DeferredOtherTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The net amount of all increases and decreases in unrecognized tax benefits for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: