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Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 7,200,000 |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 3,900,000 |  |
Components of Deferred Tax Assets [Abstract] |  |  |
Net operating loss |  | 134,418,000 | 110,989,000
Pension |  | 0 | 26,452,000
Regulatory liabilities related to income taxes |  | 83,838,000 | 53,439,000
Other |  | 144,126,000 | 129,801,000
Total deferred tax assets |  | 362,382,000 | 320,681,000
Components of Deferred Tax Liabilities [Abstract] |  |  |
Depreciation and plant related |  | (814,671,000) | (759,587,000)
Investment tax credit |  | (25,855,000) | (14,242,000)
Regulatory assets related to income taxes |  | (66,352,000) | (59,471,000)
Stranded costs |  | (22,262,000) | (24,934,000)
Deferred Tax Liabilities, Compensation and Benefits, Pensions |  | (58,780,000) | 0
Other |  | (143,044,000) | (178,492,000)
Total deferred tax liabilities |  | (1,130,964,000) | (1,036,726,000)
Deferred Tax Assets (Liabilities), Net [Abstract] |  |  |
Net accumulated deferred income tax liabilities |  | (768,582,000) | (716,045,000)
Current accumulated deferred income tax (asset) liability |  | (58,681,000) | 258,000
Non-current accumulated deferred income tax liability |  | (827,263,000) | (715,787,000)
Public Service Company of New Mexico [Member] |  |  |
Components of Deferred Tax Assets [Abstract] |  |  |
Net operating loss |  | 99,247,000 | 93,980,000
Pension |  | 0 | 32,532,000
Regulatory liabilities related to income taxes |  | 78,849,000 | 48,027,000
Other |  | 67,179,000 | 55,629,000
Total deferred tax assets |  | 245,275,000 | 230,168,000
Components of Deferred Tax Liabilities [Abstract] |  |  |
Depreciation and plant related |  | (661,239,000) | (624,724,000)
Investment tax credit |  | (25,855,000) | (14,242,000)
Regulatory assets related to income taxes |  | (55,844,000) | (48,726,000)
Deferred Tax Liabilities, Compensation and Benefits, Pensions |  | (52,104,000) | 0
Other |  | (83,500,000) | (134,046,000)
Total deferred tax liabilities |  | (878,542,000) | (821,738,000)
Deferred Tax Assets (Liabilities), Net [Abstract] |  |  |
Net accumulated deferred income tax liabilities |  | (633,267,000) | (591,570,000)
Current accumulated deferred income tax (asset) liability |  | (43,827,000) | 3,447,000
Non-current accumulated deferred income tax liability |  | (677,094,000) | (588,123,000)
Texas-New Mexico Power Company [Member] |  |  |
Components of Deferred Tax Assets [Abstract] |  |  |
Regulatory liabilities related to income taxes |  | 4,988,000 | 5,412,000
Other |  | 23,479,000 | 16,702,000
Total deferred tax assets |  | 28,467,000 | 22,114,000
Components of Deferred Tax Liabilities [Abstract] |  |  |
Depreciation and plant related |  | (151,581,000) | (133,686,000)
Regulatory assets related to income taxes |  | (10,509,000) | (10,745,000)
Deferred Tax Liability, Loss on reacquired debt |  | (13,516,000) | (599,000)
Stranded costs |  | (22,262,000) | (24,934,000)
Other |  | (14,295,000) | (14,729,000)
Total deferred tax liabilities |  | (212,163,000) | (184,693,000)
Deferred Tax Assets (Liabilities), Net [Abstract] |  |  |
Net accumulated deferred income tax liabilities |  | (183,696,000) | (162,579,000)
Current accumulated deferred income tax (asset) liability |  | (6,501,000) | (1,131,000)
Non-current accumulated deferred income tax liability |  | $ (190,197,000) | $ (163,710,000)

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