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Pension and Other Postretirement Benefit Plans (Other Postretirement Benefits) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
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 | $ 17,000 | $ 17,199 | $ 16,743
Public Service Company of New Mexico [Member] | 401 (k) plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Expenses recognized | 12,541 | 12,788 | 11,698
Texas-New Mexico Power Company [Member] | 401 (k) plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Expenses recognized | 3,723 | 3,496 | 3,323
Non-qualified plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Compensation expense | 1,931 | 2,500 | 2,073
Non-qualified plan [Member] | Public Service Company of New Mexico [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Compensation expense | 1,407 | 1,871 | 1,299
Non-qualified plan [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Compensation expense | $ 431 | $ 478 | $ 405

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- Definition Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent + References No definition available. + Details
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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 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + 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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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