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Income Taxes - Carryforwards (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |  |  |  |  |
New Mexico corporate tax rate being phased in |  |  |  |  | 7.60%
New Mexico Corporate tax rate, effective by 2018 |  |  |  | 5.90% |
Regulatory liability | $ (7,132,000) | $ (1,903,000) | $ (5,106,000) |  |
Increase/Decrease in Income Tax expense due to tax rate change | (712,000) | 674,000 | 71,000 |  |
Income Taxes, Impairment of Carryforwards [Abstract] |  |  |  |  |
State tax credit carryforwards | 0 | 3,092,000 | 894,000 |  |
State net operating loss carryforwards | (311,000) | 5,278,000 | 3,129,000 |  |
Charitable contribution carryforwards | 0 | 2,042,000 |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
State tax credit carryforwards | 3,986,000 | 6,378,000 |  |  |
State net operating loss carryforwards | 361,000 | 361,000 |  |  |
Charitable contribution carryforwards | 659,000 | 659,000 |  |  |
Liability (refund) adjustment from settlement with taxing authority |  |  | (2,000,000) |  |
Income tax expense (benefit) | 63,278,000 | 15,075,000 | 69,738,000 |  |
Corporate and Other [Member] |  |  |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
Income tax expense (benefit) | (1,480,000) | 3,708,000 | (5,418,000) |  |
Internal Revenue Service (IRS) [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Federal net operating loss carryforwards | 420,100,000 |  |  |  |
Federal tax credit carryforwards that expire beginning in 2023 | 78,700,000 |  |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
Income tax expense (benefit) |  |  | (200,000) |  |
Internal Revenue Service (IRS) [Member] | Corporate and Other [Member] |  |  |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
Income tax expense (benefit) |  |  | (1,300,000) |  |
Public Service Company of New Mexico [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Regulatory liability | (7,132,000) | (1,903,000) | (5,106,000) |  |
Increase/Decrease in Income Tax expense due to tax rate change | (804,000) | 470,000 | 312,000 |  |
Income Taxes, Impairment of Carryforwards [Abstract] |  |  |  |  |
State tax credit carryforwards | 0 | 0 | 0 |  |
State net operating loss carryforwards | (213,000) | 3,619,000 | 2,145,000 |  |
Charitable contribution carryforwards | 0 | 0 |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
State tax credit carryforwards | 0 | 0 |  |  |
State net operating loss carryforwards | 248,000 | 248,000 |  |  |
Charitable contribution carryforwards | 0 | 0 |  |  |
Income tax expense (benefit) | 40,922,000 | (12,758,000) | 52,633,000 |  |
Public Service Company of New Mexico [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
Income tax expense (benefit) |  |  | 1,100,000 |  |
Texas-New Mexico Power Company [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Regulatory liability | 0 | 0 | 0 |  |
Increase/Decrease in Income Tax expense due to tax rate change | 0 | 0 | 0 |  |
Income Taxes, Impairment of Carryforwards [Abstract] |  |  |  |  |
State tax credit carryforwards | 0 | 0 | 0 |  |
State net operating loss carryforwards | 0 | 0 | 0 |  |
Charitable contribution carryforwards | 0 | 0 |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
State tax credit carryforwards | 0 | 0 |  |  |
State net operating loss carryforwards | 0 | 0 |  |  |
Charitable contribution carryforwards | 0 | 0 |  |  |
Income tax expense (benefit) | 23,836,000 | $ 24,125,000 | 22,523,000 |  |
Texas-New Mexico Power Company [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
Income tax expense (benefit) |  |  | $ 0 |  |
2015 Electric Rate Case [Member] | Public Service Company of New Mexico [Member] |  |  |  |  |
Income Taxes, Reserve Balances [Abstract] |  |  |  |  |
Approval to recover impairment of net operating loss carryforward | $ (2,100,000) |  |  |  |
Recovery period of regulatory asset |  | 2 years |  |  |

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