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Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The fair values of investments held by the employee benefit plans are as follows:

					GAAP Fair Value Hierarchy
	Total				Quoted Prices in Active Market for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
December 31, 2012					(In thousands)
PNM Pension Plan
Participation in PNMR Master Trust Total Plan Investments	$	517,238			$	205,491			$	232,730			$	79,017
TNMP Pension Plan
Participation in PNMR Master Trust Total Plan Investments	$	66,450			$	26,462			$	25,817			$	14,171
PNM OPEB Plan
Cash and equivalents	$	4,976			$	4,976			$	—			$	—
Equity securities:
International funds	2,651				—				2,651				—
Domestic growth	46,145				19,511				26,634				—
Other funds	7,588				—				7,588				—
Fixed income securities:
Mutual funds	4,176				4,176				—				—
Total Assets	$	65,536			$	28,663			$	36,873			$	—
TNMP OPEB Plan
Cash and equivalents	$	42			$	42			$	—			$	—
Equity securities:
International funds	1,444				—				1,444				—
Domestic growth	1,289				1,289				—				—
Other funds	3,660				—				3,660				—
Fixed income securities:
Mutual funds	2,325				2,325				—				—
Total Assets	$	8,760			$	3,656			$	5,104			$	—

					GAAP Fair Value Hierarchy
	Total				Quoted Prices in Active Market for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
December 31, 2011	(In thousands)
PNM Pension Plan
Participation in PNMR Master Trust	$	444,466			$	176,279			$	184,054			$	84,133
TNMP Pension Plan
Participation in PNMR Master Trust	$	62,139			$	24,118			$	23,466			$	14,555
PNM OPEB Plan
Cash and equivalents	$	1,128			$	1,128			$	—			$	—
Equity securities:
International funds	2,740				—				2,740				—
Domestic value	1,289				1,289				—				—
Domestic growth	43,016				22,215				20,801				—
Other funds	7,678				—				7,678				—
Fixed income securities:
Mutual funds	4,006				4,006				—				—
Total Assets	$	59,857			$	28,638			$	31,219			$	—
TNMP OPEB Plan
Cash and equivalents	$	180			$	180			$	—			$	—
Equity securities:
International funds	1,248				—				1,248				—
Domestic value	551				551				—				—
Domestic growth	738				738				—				—
Other funds	3,048				—				3,048				—
Fixed income securities:
Mutual funds	2,694				2,694				—				—
Total Assets	$	8,459			$	4,163			$	4,296			$	—

The fair values of investments in the PNMR Master Trust are as follows:

					GAAP Fair Value Hierarchy
	Total				Quoted Prices in Active Market for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
December 31, 2012	(In thousands)
PNMR Master Trust
Cash and equivalents	$	10,404			$	10,404			$	—			$	—
Equity securities:
International	39,867				39,867				—				—
Domestic value	39,492				39,492				—				—
Domestic growth	63,888				63,888				—				—
Other funds	17,035				—				17,035				—
Fixed income securities:
Corporate	101,936				—				101,936				—
United States government	148,341				78,302				70,039				—
Municipals	3,639				—				3,639				—
Other funds	65,898				—				65,898				—
Alternative investments:
Private equity funds	38,212				—				—				38,212
Hedge funds	31,277				—				—				31,277
Real estate funds	23,699				—				—				23,699
Total Fair Value of Plan Investments	$	583,688			$	231,953			$	258,547			$	93,188
December 31, 2011
PNMR Master Trust
Cash and equivalents	$	6,753			$	6,753			$	—			$	—
Equity securities:
International	37,173				37,173				—				—
Domestic value	58,350				57,437				913				—
Domestic growth	65,004				65,004				—				—
Other funds	15,271				—				15,271				—
Fixed income securities:
Corporate	59,730				—				59,730				—
United States government	104,102				34,030				70,072				—
Municipals	3,478				—				3,478				—
Other funds	58,056				—				58,056				—
Alternative investments:
Private equity funds	37,100				—				—				37,100
Hedge funds	36,904				—				—				36,904
Real estate funds	24,684				—				—				24,684
Total Assets	$	506,605			$	200,397			$	207,520			$	98,688

A reconciliation of the changes in Level 3 fair value measurements is as follows:

	Year Ended December 31,
Level 3 Fair Value Assets and Liabilities	2012				2011
	(In thousands)
PNM Pension	Master Trust				Master Trust
Balance at beginning of period	$	84,133			$	78,940
Actual return on assets sold during the period	2,627				1,624
Actual return on assets still held at period end	2,386				1,404
Purchases	5,498				4,030
Sales	(15,627		)		(1,865		)
Balance at end of period	$	79,017			$	84,133
TNMP Pension
Balance at beginning of period	$	14,555			$	13,659
Actual return on assets sold during the period	197				280
Actual return on assets still held at period end	179				243
Purchases	413				695
Sales	(1,173		)		(322		)
Balance at end of period	$	14,171			$	14,555

Additional information concerning changes in Level 3 fair value measurements for the PNMR Master Trust is as follows:

Level 3 Fair Value Assets and Liabilities

PNMR Master Trust	Private equity funds				Hedge funds				Real estate funds				Total
					(In thousands)
Balance at December 31, 2010	$	32,935			$	37,622			$	22,042			$	92,599
Actual return on assets sold during the period	1,904				—				—				1,904
Actual return on assets still held at period end	2,372				(718		)		(7		)		1,647
Purchases	2,076				—				2,649				4,725
Sales	(2,187		)		—				—				(2,187		)
Balance at December 31, 2011	37,100				36,904				24,684				98,688
Actual return on assets sold during the period	2,966				(80		)		(62		)		2,824
Actual return on assets still held at period end	40				2,453				72				2,565
Purchases	3,906				—				2,005				5,911
Sales	(5,800		)		(8,000		)		(3,000		)		(16,800		)
Balance at December 31, 2012	$	38,212			$	31,277			$	23,699			$	93,188

Schedule of Defined Contribution Plan Expenses [Table Text Block]

A summary of expenses for these other retirement plans is as follows:

	Year Ended December 31,
	2012				2011				2010
	(In thousands)
PNMR
401(k) plan	$	16,185			$	17,000			$	17,199
Non-qualified plan	$	1,491			$	1,931			$	2,500
PNM
401(k) plan	$	12,427			$	12,541			$	12,788
Non-qualified plan	$	1,143			$	1,407			$	1,871
TNMP
401(k) plan	$	3,739			$	3,723			$	3,496
Non-qualified plan	$	327			$	431			$	478

Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following table presents information about the PBO, fair value of plan assets, and funded status of the plans:

	PNM Plan								TNMP Plan
	Year Ended December 31,								Year Ended December 31,
	2012				2011				2012				2011
	(In thousands)
PBO at beginning of year	$	588,874			$	593,457			$	67,234			$	72,260
Service cost	—				—				—				—
Interest cost	32,232				32,804				3,635				3,800
Actuarial (gain) loss	94,361				1,197				11,434				(2,793		)
Benefits paid	(39,918		)		(38,584		)		(5,663		)		(6,033		)
PBO at end of year	675,549				588,874				76,640				67,234
Fair value of plan assets at beginning of year	427,386				392,788				59,952				60,387
Actual return on plan assets	52,927				31,671				6,951				4,447
Employer contributions	77,700				41,511				5,300				1,151
Benefits paid	(39,918		)		(38,584		)		(5,663		)		(6,033		)
Fair value of plan assets at end of year	518,095				427,386				66,540				59,952
Funded status-asset (liability) for pension benefits	$	(157,454	)		$	(161,488	)		$	(10,100	)		$	(7,282	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The following table presents pre-tax information about prior service cost and net actuarial (gain) loss in AOCI as of December 31, 2012.

	PNM Plan								TNMP Plan
	December 31, 2012								December 31, 2012
	Prior service cost				Net actuarial (gain) loss				Net actuarial (gain) loss
	(In thousands)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	$	171			$	134,088			$	—
Experience loss (gain)	—				82,734				9,807
Regulatory asset (liability) adjustment	(1		)		(52,423		)		(9,807		)
Amortization recognized in net periodic benefit cost (income)	(138		)		(4,573		)		—
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	$	32			$	159,826			$	—
Amortization expected to be recognized in 2013	$	(32	)		$	(6,233	)		$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit cost (income):

	Year Ended December 31,
	2012				2011				2010
	(In thousands)
PNM Plan
Service cost	$	—			$	—			$	—
Interest cost	32,232				32,804				34,073
Expected return on plan assets	(41,301		)		(37,075		)		(37,354		)
Amortization of net (gain) loss	10,516				9,209				6,450
Amortization of prior service cost	317				317				317
Net periodic benefit cost	$	1,764			$	5,255			$	3,486
TNMP Plan
Service cost	$	—			$	—			$	—
Interest cost	3,635				3,800				4,126
Expected return on plan assets	(5,324		)		(5,470		)		(5,794		)
Amortization of net (gain) loss	462				346				—
Amortization of prior service cost	—				—				—
Net periodic benefit cost (income)	$	(1,227	)		$	(1,324	)		$	(1,668	)

Schedule of Assumptions Used [Table Text Block]

The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost (income). Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost (income) would be affected.

	Year Ended December 31,
PNM Plan	2012			2011			2010
Discount rate for determining December 31 PBO	4.30	%		5.67	%		5.72	%
Discount rate for determining net periodic benefit cost (income)	5.67	%		5.72	%		6.47	%
Expected return on plan assets	8.25	%		8.50	%		8.75	%
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 PBO	4.19	%		5.69	%		5.50	%
Discount rate for determining net periodic benefit cost (income)	5.69	%		5.50	%		6.31	%
Expected return on plan assets	8.25	%		8.50	%		8.75	%
Rate of compensation increase	N/A			N/A			N/A

Schedule of Expected Benefit Payments [Table Text Block]

The following pension benefit payments are expected to be paid:

	PNM Plan				TNMP Plan
	(In thousands)
2013	$	42,186			$	5,922
2014	42,979				6,189
2015	43,573				6,385
2016	44,092				5,982
2017	44,608				5,893
2018 – 2022	223,777				26,193

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following table presents information about the APBO, the fair value of plan assets, and the funded status of the plans:

	PNM Plan								TNMP Plan
	Year Ended December 31,								Year Ended December 31,
	2012				2011				2012				2011
	(In thousands)
APBO at beginning of year	$	96,221			$	99,486			$	11,344			$	12,152
Service cost	217				259				244				306
Interest cost	5,293				5,378				624				654
Participant contributions	2,266				2,206				404				281
Actuarial (gain) loss	5,008				712				2,727				(862		)
Benefits paid	(9,392		)		(10,315		)		(1,665		)		(1,187		)
Plan amendments	—				(1,505		)		—				—
APBO at end of year	99,613				96,221				13,678				11,344
Fair value of plan assets at beginning of year	58,776				61,749				8,303				8,596
Actual return on plan assets	9,285				2,263				1,259				262
Employer contributions	3,529				2,873				342				351
Participant contributions	2,266				2,206				404				281
Benefits paid	(9,392		)		(10,315		)		(1,665		)		(1,187		)
Fair value of plan assets at end of year	64,464				58,776				8,643				8,303
Funded status-asset (liability)	$	(35,149	)		$	(37,445	)		$	(5,035	)		$	(3,041	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The following table presents pre-tax information about the PNM Plan prior service cost and net actuarial (gain) loss in AOCI as of December 31, 2012.

	PNM Plan								TNMP Plan
	December 31, 2012								December 31, 2012
	Prior service cost (credit)				Net actuarial (gain) loss				Prior service cost				Net actuarial (gain) loss
	(In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	$	(121	)		$	960			$	—			$	—
Experience loss (gain)	—				623				—				1,985
Regulatory asset (liability) adjustment	156				(1,683		)		—				(1,985		)
Amortization recognized in net periodic benefit cost (income)	(35		)		100				—
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	$	—			$	—			$	—			$	—
Amortization expected to be recognized in 2013	$	—			$	—			$	—			$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit cost:

	Year Ended December 31,
	2012				2011				2010
	(In thousands)
PNM Plan
Service cost	$	217			$	259			$	419
Interest cost	5,293				5,378				7,650
Expected return on plan assets	(4,901		)		(5,388		)		(5,572		)
Amortization of net (gain) loss	3,888				3,205				5,489
Amortization of prior service credit	(1,343		)		(2,648		)		(4,143		)
Net periodic benefit cost	$	3,154			$	806			$	3,843
TNMP Plan
Service cost	$	244			$	306			$	289
Interest cost	624				654				711
Expected return on plan assets	(516		)		(533		)		(514		)
Amortization of net (gain) loss	(209		)		(193		)		(195		)
Amortization of prior service cost	57				60				60
Net periodic benefit cost	$	200			$	294			$	351

Schedule of Assumptions Used [Table Text Block]

The following significant weighted-average assumptions were used to determine the APBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the APBO and net periodic benefit cost would be affected.

	Year Ended December 31,
PNM Plan	2012			2011			2010
Discount rate for determining December 31 APBO	4.26	%		5.70	%		5.59	%
Discount rate for determining net periodic benefit cost	5.70	%		5.59	%		6.42	%
Expected return on plan assets	8.50	%		8.50	%		8.75	%
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 APBO	4.26	%		5.70	%		5.59	%
Discount rate for determining net periodic benefit cost	5.70	%		5.59	%		6.42	%
Expected return on plan assets	6.50	%		6.30	%		6.70	%
Rate of compensation increase	N/A			N/A			N/A

Schedule of Expected Benefit Payments [Table Text Block]

The following other postretirement benefit payments, which reflect expected future service, are expected to be paid:

	PNM Plan				TNMP Plan
	(In thousands)
2013	$	6,123			$	786
2014	6,327				796
2015	6,450				803
2016	6,668				823
2017	6,780				838
2018 – 2022	34,983				4,322

Schedule of Health Care Cost Trend Rates [Table Text Block]

The following table shows the assumed health care cost trend rates:

	PNM Plan
	December 31,
	2012			2011
Health care cost trend rate assumed for next year	7.0	%		7.5	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.0	%		5.0	%
Year that the rate reaches the ultimate trend rate	2017			2017

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

The following table shows the impact of a one-percentage-point change in assumed health care cost trend rates:

	PNM Plan
	1-Percentage- Point  Increase				1-Percentage- Point  Decrease
	(In thousands)
Effect on total of service and interest cost	$	395			$	(342	)
Effect on APBO	$	6,454			$	(5,550	)

Executive Retirement Program [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The following table presents pre-tax information about net actuarial loss in AOCI as of December 31, 2012.

	December 31, 2012
	PNM Plan				TNMP Plan
	(In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year	$	1,354			$	—
Experience loss (gain)	1,895				107
Regulatory asset (liability) adjustment	(1,216		)		(107		)
Amortization recognized in net periodic benefit cost (income)	36				—
Amount in AOCI not yet recognized in net periodic benefit cost at end of year	$	2,069			$	—
Amortization expected to be recognized in 2013	$	(98	)		$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit:

	Year Ended December 31,
	2012				2011				2010
	(In thousands)
PNM Plan
Service cost	$	—			$	—			$	—
Interest cost	876				930				1,053
Amortization of net loss	83				93				71
Amortization of prior service cost	—				—				—
Net periodic benefit cost	$	959			$	1,023			$	1,124
TNMP Plan
Service cost	$	—			$	—			$	—
Interest cost	45				46				52
Amortization of net (gain) loss	—				—				(4		)
Amortization of prior service cost	—				—				—
Net periodic benefit cost	$	45			$	46			$	48

Schedule of Assumptions Used [Table Text Block]

The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost would be affected.

	Year Ended December 31,
PNM Plan	2012			2011			2010
Discount rate for determining December 31 PBO	4.30	%		5.67	%		5.72	%
Discount rate for determining net periodic benefit cost	5.67	%		5.72	%		6.47	%
Long-term rate of return on plan assets	N/A			N/A			N/A
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 PBO	4.19	%		5.69	%		5.50	%
Discount rate for determining net periodic benefit cost	5.69	%		5.50	%		6.31	%
Long-term rate of return on plan assets	N/A			N/A			N/A
Rate of compensation increase	N/A			N/A			N/A

Schedule of Expected Benefit Payments [Table Text Block]

The following executive retirement plan payments, which reflect expected future service, are expected:

	PNM Plan				TNMP Plan
	(In thousands)
2013	$	1,452			$	92
2014	1,436				91
2015	1,418				89
2016	1,396				87
2017	1,371				85
2018 – 2022	6,340				371

Schedule of Net Funded Status [Table Text Block]

For the executive retirement programs, the following table presents information about the PBO and funded status of the plans:

	PNM Plan								TNMP Plan
	Year Ended December 31,								Year Ended December 31,
	2012				2011				2012				2011
	(In thousands)
PBO at beginning of year	$	16,191			$	17,020			$	844			$	884
Service cost	—				—				—				—
Interest cost	876				930				45				46
Actuarial (gain) loss	1,895				(252		)		107				8
Benefits paid	(1,495		)		(1,507		)		(94		)		(94		)
PBO at end of year-funded status	17,467				16,191				902				844
Less current liability	1,452				1,436				90				89
Non-current liability	$	16,015			$	14,755			$	812			$	755

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- Definition

Schedule of Defined Contribution Plan Expenses [Table Text Block]

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No definition available.

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- Definition

Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (s)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)

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- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 158

-Paragraph 4, 7, 16, 20, 21

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-Number 132R

-Paragraph 5

-Subparagraph d

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-Number 132R

-Paragraph 5, 6, 7

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- Definition

Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved.

+ References

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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)

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Tabular disclosure of net funded status of pension plans and/or other employee benefit plans.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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-Paragraph 1

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