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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Decrease in regulatory liabilities due to change in state corporate tax rate |  | $ 2,000 |  |  | $ 4,600 |  |
Decrease in deferred tax asset due to change in state corporate tax rate |  |  |  |  | $ 200 |  |
Income Taxes | $ 35,752 |  | $ 31,055 |  |  | $ 61,621 | $ 53,368
State net operating loss carryforward, impairment | 300 | 1,000 |  |  |  |  |
Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Taxes |  |  |  | $ 1,300 |  |  |
PNM Resources [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income tax examination, liability (refund) adjustment from settlement with taxing authority |  |  |  | (2,000) |  |  |
Income Taxes |  |  |  | 200 |  |  |
Public Service Company of New Mexico [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Taxes |  |  |  | 1,100 |  |  |
Texas-New Mexico Power Company [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Taxes |  |  |  | $ 0 |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Increase in deferred tax asset not related to regulatory activity, as a result of tax rate change |  | 700 |  |  |  |  |
Decrease in income tax expense due to tax rate change |  | 500 |  |  |  |  |
Income Taxes | 27,258 |  | 25,142 |  |  | 44,560 | 42,331
State net operating loss carryforward, impairment | 200 | 700 |  |  |  |  |
Corporate and Other [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Decrease in income tax expense due to tax rate change |  | 200 |  |  |  |  |
Income Taxes | 699 |  | $ (1,528) |  |  | $ (2,139) | $ (6,044)
State net operating loss carryforward, impairment | 100 | $ 300 |  |  |  |  |
New Mexico wind energy production tax credit carryforward, Impairment | $ 1,000 |  |  |  |  |  |

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