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Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Components of Deferred Tax Assets [Abstract] |  |
Net operating loss | $ 86,985 | $ 72,950
Pension | 50,515 | 58,267
Regulatory liabilities related to income taxes | 49,413 | 17,037
Optim Energy | 0 | 46,508
Other | 109,875 | 96,379
Total deferred tax assets | 296,788 | 291,141
Components of Deferred Tax Liabilities [Abstract] |  |
Depreciation and plant related | (697,528) | (579,505)
Investment tax credit | (15,771) | (18,089)
Regulatory assets related to income taxes | (56,312) | (53,287)
Stranded costs | (28,439) | (33,287)
Other | (168,688) | (164,282)
Total deferred tax liabilities | 966,738 | 848,450
Deferred Tax Assets (Liabilities), Net [Abstract] |  |
Net accumulated deferred income tax liabilities | (669,950) | (557,309)
Current accumulated deferred income tax (asset) liability | 9,080 | (886)
Non-current accumulated deferred income tax liability | (660,870) | (558,195)
Texas-New Mexico Power Company [Member] |  |
Components of Deferred Tax Assets [Abstract] |  |
Regulatory liabilities related to income taxes | 5,835 | 6,259
Other | 16,043 | 16,638
Total deferred tax assets | 21,878 | 22,897
Components of Deferred Tax Liabilities [Abstract] |  |
Depreciation and plant related | (125,270) | (103,456)
Regulatory assets related to income taxes | (10,981) | (11,217)
Stranded costs | (28,439) | (33,287)
Other | (14,113) | (15,182)
Total deferred tax liabilities | 178,803 | 163,142
Deferred Tax Assets (Liabilities), Net [Abstract] |  |
Net accumulated deferred income tax liabilities | (156,925) | (140,245)
Current accumulated deferred income tax (asset) liability | (2,272) | (1,876)
Non-current accumulated deferred income tax liability | (159,197) | (142,121)
Public Service Company of New Mexico [Member] |  |
Components of Deferred Tax Assets [Abstract] |  |
Net operating loss | 72,615 | 66,320
Pension | 54,270 | 61,055
Regulatory liabilities related to income taxes | 43,578 | 10,779
Other | 47,263 | 52,161
Total deferred tax assets | 217,726 | 190,315
Components of Deferred Tax Liabilities [Abstract] |  |
Depreciation and plant related | (570,278) | (476,533)
Investment tax credit | (15,771) | (18,089)
Regulatory assets related to income taxes | (45,331) | (42,070)
Other | (123,098) | (128,152)
Total deferred tax liabilities | 754,478 | 664,844
Deferred Tax Assets (Liabilities), Net [Abstract] |  |
Net accumulated deferred income tax liabilities | (536,752) | (474,529)
Current accumulated deferred income tax (asset) liability | 16,562 | 9,783
Non-current accumulated deferred income tax liability | $ (520,190) | $ (464,746)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax reductions attributable to the difference between the tax basis and the generally accepted accounting principles basis of a company's equity method investment which will decrease future taxable income when such basis difference reverses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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 FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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- Definition For entities that net deferred tax assets and tax liabilities, represents the net amount of deferred tax assets (after reduction for valuation allowance) and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities that are classified as current in the financial statements, or that are expected to reverse in the next twelve months (or normal operating cycle, if longer). A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42, 43 -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 FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31917-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31931-109318 + Details
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- Definition The cumulative amount of the estimated future tax effects attributable to other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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 Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph a, d, e -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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