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Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Components of Deferred Tax Assets [Abstract] |  |
Net operating loss | $ 110,989 | $ 86,985
Pension | 26,452 | 50,515
Regulatory liabilities related to income taxes | 53,439 | 49,413
Other | 129,801 | 109,875
Total deferred tax assets | 320,681 | 296,788
Components of Deferred Tax Liabilities [Abstract] |  |
Depreciation and plant related | (759,587) | (697,528)
Investment tax credit | (14,242) | (15,771)
Regulatory assets related to income taxes | (59,471) | (56,312)
Stranded costs | (24,934) | (28,439)
Other | (178,492) | (168,688)
Total deferred tax liabilities | (1,036,726) | (966,738)
Deferred Tax Assets (Liabilities), Net [Abstract] |  |
Net accumulated deferred income tax liabilities | (716,045) | (669,950)
Current accumulated deferred income tax (asset) liability | 258 | 9,080
Non-current accumulated deferred income tax liability | (715,787) | (660,870)
Texas-New Mexico Power Company [Member] |  |
Components of Deferred Tax Assets [Abstract] |  |
Regulatory liabilities related to income taxes | 5,412 | 5,835
Other | 16,702 | 16,043
Total deferred tax assets | 22,114 | 21,878
Components of Deferred Tax Liabilities [Abstract] |  |
Depreciation and plant related | (133,686) | (125,270)
Regulatory assets related to income taxes | (10,745) | (10,981)
Stranded costs | (24,934) | (28,439)
Other | (15,328) | (14,113)
Total deferred tax liabilities | (184,693) | (178,803)
Deferred Tax Assets (Liabilities), Net [Abstract] |  |
Net accumulated deferred income tax liabilities | (162,579) | (156,925)
Current accumulated deferred income tax (asset) liability | (1,131) | (2,272)
Non-current accumulated deferred income tax liability | (163,710) | (159,197)
Public Service Company of New Mexico [Member] |  |
Components of Deferred Tax Assets [Abstract] |  |
Net operating loss | 93,980 | 72,615
Pension | 32,532 | 54,270
Regulatory liabilities related to income taxes | 48,027 | 43,578
Other | 55,629 | 47,263
Total deferred tax assets | 230,168 | 217,726
Components of Deferred Tax Liabilities [Abstract] |  |
Depreciation and plant related | (624,724) | (570,278)
Investment tax credit | (14,242) | (15,771)
Regulatory assets related to income taxes | (48,726) | (45,331)
Other | (134,046) | (123,098)
Total deferred tax liabilities | (821,738) | (754,478)
Deferred Tax Assets (Liabilities), Net [Abstract] |  |
Net accumulated deferred income tax liabilities | (591,570) | (536,752)
Current accumulated deferred income tax (asset) liability | 3,447 | 16,562
Non-current accumulated deferred income tax liability | $ (588,123) | $ (520,190)

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