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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unrealized holding gains (losses) arising during the period, income tax (expense)	$ (13,577)	$ (6,643)	$ (7,462)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense	13,956	3,070	1,538
Pension liability adjustment, income tax (expense) benefit	(512)	5,114	43,542
Change in fair market value, income tax (expense)	349	(4,839)	(7,471)
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit)	(1,230)	18,120	20,421
Public Service Company of New Mexico [Member]
Unrealized holding gains (losses) arising during the period, income tax (expense)	(13,577)	(6,643)	(7,462)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense	13,956	3,070	1,538
Pension liability adjustment, income tax (expense) benefit	(360)	5,071	43,510
Change in fair market value, income tax (expense)	0	(3,406)	(6,634)
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit)	(11)	11,725	14,629
Texas-New Mexico Power Company [Member]
Pension liability adjustment, income tax (expense) benefit	(152)	42	32
Change in fair market value, income tax (expense)	430	1,139	182
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit)	$ (1,068)	$ (399)	$ (252)

X

- Definition

The tax effect of the amount of the change in the additional minimum pension liability not yet recognized pursuant to FAS 87 as a net periodic pension cost. If the additional pension liability required to be recognized exceeds the unrecognized prior service costs, then the excess (which is the net loss not yet recognized as net periodic pension cost) is to be recorded as a separate component in other comprehensive income, before adjusting for tax effects. In a subsequent measurement, the elimination or adjustment to the amount of the minimum pension liability recorded in accumulated other comprehensive income is included in this line. Eliminated upon adoption of FAS 158.

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-Publisher FASB

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-Number 130

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Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

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-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.



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Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-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.



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Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-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.



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Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-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.



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