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Pension and Other Postretirement Benefits (Other Postretirement Benefits) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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- 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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- 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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- 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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- 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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- 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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