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Pension and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2013

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

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	2013				2012
	(In thousands)
PNM Pension	Master Trust				Master Trust
Balance at beginning of period	$	79,017			$	84,133
Actual return on assets sold during the period	3,303				2,627
Actual return on assets still held at period end	3,361				2,386
Purchases	15,110				5,498
Sales	(19,800		)		(15,627		)
Balance at end of period	$	80,991			$	79,017
TNMP Pension
Balance at beginning of period	$	14,171			$	14,555
Actual return on assets sold during the period	1,400				197
Actual return on assets still held at period end	1,425				179
Purchases	6,408				413
Sales	(8,396		)		(1,173		)
Balance at end of period	$	15,008			$	14,171

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				Fixed income - corporate				Total
					(In thousands)
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
Actual return on assets sold during the period	4,677				135				(109		)		—				4,703
Actual return on assets still held at period end	1,162				3,500				123				1				4,786
Purchases	3,117				16,151				2,076				175				21,519
Sales	(8,046		)		(16,151		)		(4,000		)		—				(28,197		)
Balance at December 31, 2013	$	39,122			$	34,912			$	21,789			$	176			$	95,999

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,
	2013				2012				2011
	(In thousands)
PNMR
401(k) plan	$	16,785			$	16,185			$	17,000
Non-qualified plan	$	2,204			$	1,491			$	1,931
PNM
401(k) plan	$	12,952			$	12,427			$	12,541
Non-qualified plan	$	1,691			$	1,143			$	1,407
TNMP
401(k) plan	$	3,953			$	3,739			$	3,723
Non-qualified plan	$	513			$	327			$	431

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,
	2013				2012				2013				2012
	(In thousands)
PBO at beginning of year	$	675,549			$	588,874			$	76,640			$	67,234
Service cost	—				—				—				—
Interest cost	28,142				32,232				3,087				3,635
Plan amendment	(6,346		)		—				—				—
Actuarial (gain) loss	(56,533		)		94,361				(7,820		)		11,434
Benefits paid	(41,275		)		(39,918		)		(5,748		)		(5,663		)
PBO at end of year	599,537				675,549				66,159				76,640
Fair value of plan assets at beginning of year	518,095				427,386				66,540				59,952
Actual return on plan assets	19,533				52,927				4,326				6,951
Employer contributions	60,000				77,700				1,000				5,300
Benefits paid	(41,275		)		(39,918		)		(5,748		)		(5,663		)
Fair value of plan assets at end of year	556,353				518,095				66,118				66,540
Funded status – asset (liability) for pension benefits	$	(43,184	)		$	(157,454	)		$	(41	)		$	(10,100	)

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, 2013.

	PNM Plan								TNMP Plan
	December 31, 2013								December 31, 2013
	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	$	32			$	159,826			$	—
Experience loss (gain)	—				(34,136		)		(7,297		)
Regulatory asset (liability) adjustment	—				19,799				7,297
Plan amendment	(2,665		)		—				—
Amortization recognized in net periodic benefit cost (income)	(32		)		(6,233		)		—
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	$	(2,665	)		$	139,256			$	—
Amortization expected to be recognized in 2014	$	(405	)		$	5,469			$	—

Schedule of Net Benefit Costs [Table Text Block]

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

	Year Ended December 31,
	2013				2012				2011
	(In thousands)
PNM Plan
Service cost	$	—			$	—			$	—
Interest cost	28,142				32,232				32,804
Expected return on plan assets	(41,930		)		(41,301		)		(37,075		)
Amortization of net (gain) loss	14,840				10,516				9,209
Amortization of prior service cost	76				317				317
Net periodic benefit cost	$	1,128			$	1,764			$	5,255
TNMP Plan
Service cost	$	—			$	—			$	—
Interest cost	3,087				3,635				3,800
Expected return on plan assets	(4,849		)		(5,324		)		(5,470		)
Amortization of net (gain) loss	1,049				462				346
Amortization of prior service cost	—				—				—
Net periodic benefit cost (income)	$	(713	)		$	(1,227	)		$	(1,324	)

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	2013			2012			2011
Discount rate for determining December 31 PBO	5.27	%		4.30	%		5.67	%
Discount rate for determining net periodic benefit cost (income)	4.30	%		5.67	%		5.72	%
Expected return on plan assets	7.65	%		8.25	%		8.50	%
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 PBO	5.06	%		4.19	%		5.69	%
Discount rate for determining net periodic benefit cost (income)	4.19	%		5.69	%		5.50	%
Expected return on plan assets	7.65	%		8.25	%		8.50	%
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)
2014	$	54,356			$	6,111
2015	52,532				6,181
2016	52,204				5,831
2017	50,954				5,631
2018	49,325				5,696
2019 – 2023	222,241				23,804

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,
	2013				2012				2013				2012
	(In thousands)
APBO at beginning of year	$	99,613			$	96,221			$	13,678			$	11,344
Service cost	260				217				299				244
Interest cost	4,113				5,293				566				624
Participant contributions	2,537				2,266				373				404
Actuarial (gain) loss	(4,566		)		5,008				(1,080		)		2,727
Benefits paid	(9,792		)		(9,392		)		(1,570		)		(1,665		)
APBO at end of year	92,165				99,613				12,266				13,678
Fair value of plan assets at beginning of year	64,464				58,776				8,643				8,303
Actual return on plan assets	12,780				9,285				1,813				1,259
Employer contributions	3,576				3,529				342				342
Participant contributions	2,537				2,266				373				404
Benefits paid	(9,792		)		(9,392		)		(1,570		)		(1,665		)
Fair value of plan assets at end of year	73,565				64,464				9,601				8,643
Funded status – asset (liability)	$	(18,600	)		$	(35,149	)		$	(2,665	)		$	(5,035	)

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

In the year ended December 31, 2013, actuarial gains of $12.3 million and $2.4 million were recorded as regulatory assets for the PNM Plan and TNMP Plan. There were no prior service costs recorded for the year ended December 31, 2013.

Schedule of Net Benefit Costs [Table Text Block]

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

	Year Ended December 31,
	2013				2012				2011
	(In thousands)
PNM Plan
Service cost	$	260			$	217			$	259
Interest cost	4,113				5,293				5,378
Expected return on plan assets	(5,043		)		(4,901		)		(5,388		)
Amortization of net (gain) loss	4,242				3,888				3,205
Amortization of prior service credit	(1,343		)		(1,343		)		(2,648		)
Net periodic benefit cost	$	2,229			$	3,154			$	806
TNMP Plan
Service cost	$	299			$	244			$	306
Interest cost	566				624				654
Expected return on plan assets	(503		)		(516		)		(533		)
Amortization of net (gain) loss	—				(209		)		(193		)
Amortization of prior service cost	57				57				60
Net periodic benefit cost	$	419			$	200			$	294

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	2013			2012			2011
Discount rate for determining December 31 APBO	5.21	%		4.26	%		5.70	%
Discount rate for determining net periodic benefit cost	4.26	%		5.70	%		5.59	%
Expected return on plan assets	8.50	%		8.50	%		8.50	%
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 APBO	5.21	%		4.26	%		5.70	%
Discount rate for determining net periodic benefit cost	4.26	%		5.70	%		5.59	%
Expected return on plan assets	6.50	%		6.50	%		6.30	%
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)
2014	$	6,586			$	787
2015	6,720				795
2016	6,943				815
2017	7,080				833
2018	7,306				852
2019 - 2023	36,569				4,558

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,
	2013			2012
Health care cost trend rate assumed for next year	7.5	%		7.0	%
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	2019			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	$	322			$	(274	)
Effect on APBO	$	5,859			$	(4,826	)

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, 2013.

	December 31, 2013
	PNM Plan				TNMP Plan
	(In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year	$	2,069			$	—
Experience loss (gain)	(330		)		(22		)
Regulatory asset (liability) adjustment	192				22
Amortization recognized in net periodic benefit cost (income)	(98		)		—
Amount in AOCI not yet recognized in net periodic benefit cost at end of year	$	1,833			$	—
Amortization expected to be recognized in 2014	$	88			$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit:

	Year Ended December 31,
	2013				2012				2011
	(In thousands)
PNM Plan
Service cost	$	—			$	—			$	—
Interest cost	720				876				930
Amortization of net (gain) loss	232				83				93
Amortization of prior service cost	—				—				—
Net periodic benefit cost	$	952			$	959			$	1,023
TNMP Plan
Service cost	$	—			$	—			$	—
Interest cost	36				45				46
Amortization of net (gain) loss	—				—				—
Amortization of prior service cost	—				—				—
Net periodic benefit cost	$	36			$	45			$	46

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	2013			2012			2011
Discount rate for determining December 31 PBO	5.27	%		4.30	%		5.67	%
Discount rate for determining net periodic benefit cost	4.30	%		5.67	%		5.72	%
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	5.06	%		4.19	%		5.69	%
Discount rate for determining net periodic benefit cost	4.19	%		5.69	%		5.50	%
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)
2014	$	1,535			$	93
2015	1,516				92
2016	1,494				90
2017	1,468				88
2018	1,438				85
2019 – 2023	6,580				365

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,
	2013				2012				2013				2012
	(In thousands)
PBO at beginning of year	$	17,467			$	16,191			$	902			$	844
Service cost	—				—				—				—
Interest cost	720				876				36				45
Actuarial (gain) loss	(330		)		1,895				(21		)		107
Benefits paid	(1,494		)		(1,495		)		(94		)		(94		)
PBO at end of year – funded status	16,363				17,467				823				902
Less current liability	1,536				1,452				94				90
Non-current liability	$	14,827			$	16,015			$	729			$	812

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