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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
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)