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Pension and Other Postretirement Benefits (Other Postretirement Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Maximum annual contribution per employee (as a percent)	75.00%
Employer matching contribution (as a percent)	6.00%
Minimum [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Non-matching contribution of eligible compensation based on eligible employee's age (as a percent)	3.00%
Maximum [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Non-matching contribution of eligible compensation based on eligible employee's age (as a percent)	10.00%
401 (k) plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expenses recognized	$ 16,785	$ 16,185	$ 17,000
Public Service Company of New Mexico [Member] | 401 (k) plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expenses recognized	12,952	12,427	12,541
Texas-New Mexico Power Company [Member] | 401 (k) plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expenses recognized	3,953	3,739	3,723
Non-qualified plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Compensation expense	2,204	1,491	1,931
Non-qualified plan [Member] | Public Service Company of New Mexico [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Compensation expense	1,691	1,143	1,407
Non-qualified plan [Member] | Texas-New Mexico Power Company [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Compensation expense	$ 513	$ 327	$ 431

X

- Definition

Defined Contribution Plan, non matching contribution of eligible compensation based on eligible employee's age

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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

X

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Balance Type:	na
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X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Balance Type:	debit
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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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