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Pension and Other Postretirement Benefits - Pre-Tax Information about Prior Service Cost and Net Actuarial (Gain) loss in AOCI (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Public Service Company of New Mexico [Member] | Pension Plan [Member]
Prior service cost
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	$ (1,855)
Experience (gain) loss	0
Regulatory asset (liability) adjustment	0
Amortization recognized in net periodic benefit cost (income)	405
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	(1,450)
Amortization expected to be recognized in 2017	(405)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract]
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	146,775
Experience (gain) loss	43,283
Regulatory asset (liability) adjustment	(25,104)
Amortization recognized in net periodic benefit cost (income)	(5,805)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	159,149
Amortization expected to be recognized in 2017	6,320
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract]
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	2,084
Experience (gain) loss	768
Regulatory asset (liability) adjustment	(445)
Amortization recognized in net periodic benefit cost (income)	(108)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	2,299
Amortization expected to be recognized in 2017	132
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract]
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	0
Experience (gain) loss	4,960
Regulatory asset (liability) adjustment	(4,960)
Amortization recognized in net periodic benefit cost (income)	0
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	0
Amortization expected to be recognized in 2017	0
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract]
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	0
Experience (gain) loss	47
Regulatory asset (liability) adjustment	(47)
Amortization recognized in net periodic benefit cost (income)	0
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	0
Amortization expected to be recognized in 2017	$ 0

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Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Actuarial (Gain) Loss, Regulatory Asset (Liability) Adjustment, before Tax

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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