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Income Taxes (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2013
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease |  |  |  |  |  |  | $ 1,500,000
New Mexico Corporate tax rate, current | 7.60% |  |  | 7.60% |  |  |
New Mexico Corporate tax rate, 2014 | 5.90% |  |  | 5.90% |  |  |
Increase in regulatory liabilities due to change in state corporate tax rate | 23,900,000 |  |  |  |  |  |
Increase in income tax expense due to change in state corporate tax rate |  |  | 1,200,000 |  |  |  |
Decrease in regulatory liabilities due to change in state corporate tax rate |  | 4,600,000 |  |  |  |  |
Decrease in deferred tax asset due to change in state corporate tax rate |  | 200,000 |  |  |  |  |
Additional Income Tax Expense, Impairment of NM Wind Credits |  |  | 2,400,000 |  |  |  |
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset |  |  |  |  |  | 19,900,000 |
Income Tax Expense (Benefit) | (15,893,000) |  | (20,334,000) | (22,313,000) | (28,303,000) |  |
Liability for Uncertain Tax Positions, Noncurrent | 14,300,000 |  |  | 14,300,000 |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset |  |  |  |  |  | 11,200,000 |
Income Tax Expense (Benefit) | (13,106,000) |  | (14,943,000) | (17,189,000) | (21,532,000) |  |
Liability for Uncertain Tax Positions, Noncurrent | 11,500,000 |  |  | 11,500,000 |  |  |
Texas-New Mexico Power Company [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncements Not Yet Adopted, Effect on Deferred Tax Asset |  |  |  |  |  | 6,800,000 |
Income Tax Expense (Benefit) | (5,590,000) |  | (5,055,000) | (9,640,000) | (7,345,000) |  |
Liability for Uncertain Tax Positions, Noncurrent | 0 |  |  | 0 |  |  |
Tax Years 2003 and 2005 - 2008 [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) | 1,300,000 |  |  |  |  |  |
Tax Years 2003 and 2005 - 2008 [Member] | Public Service Company of New Mexico [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) | (1,100,000) |  |  |  |  |  |
Tax Years 2003 and 2005 - 2008 [Member] | Texas-New Mexico Power Company [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) | 0 |  |  |  |  |  |
Tax Years 2003 and 2005 - 2008 [Member] | PNM Resources [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 2,000,000 |  |  | 2,000,000 |  |  |
Income Tax Expense (Benefit) | $ 200,000 |  |  |  |  |  |

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