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Income Taxes Carryforwards (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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% |  |
Decrease in regulatory liabilities due to change in state corporate tax rate |  | $ (1,903,000) | $ (5,106,000) |
Decrease in income tax expense due to tax rate change |  | (674,000) | (71,000) |
Increase in regulatory liabilities due to change in state corporate tax rate |  |  |  | $ 23,896,000
Increase in income tax expense due to change in state corporate tax rate |  |  |  | 1,233,000
State tax credit carryforwards, impairments |  | 3,092,000 | 894,000 | 3,880,000
State net operating loss carryforward, impairment |  | 5,278,000 | 3,129,000 |
Charitable contribution carryforward, Impairment |  | 2,042,000 |  |
State tax credit carryforwards, reserve balances |  | 6,378,000 | 5,492,000 |
State net operating loss carryforwards, reserve balances |  | 361,000 | 3,129,000 |
Charitable contribution carryforwards, reserve balances |  | 659,000 |  |
Total refunds | $ 96,200,000 |  |  |
Liability (refund) adjustment from settlement with taxing authority |  |  | 2,000,000 |
Income tax expense (benefit) |  | 15,075,000 | 69,738,000 | 59,513,000
Adjustments for New Accounting Pronouncement [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Amounts reclassified |  | 26,400,000 |  |
Corporate and Other [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax expense (benefit) |  | 3,708,000 | (5,418,000) | (6,912,000)
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Federal net operating loss carryforwards |  | 427,400,000 |  |
Federal tax credit carryforwards that expire beginning in 2023 |  | 77,400,000 |  |
Income tax expense (benefit) |  |  | (200,000) |
Internal Revenue Service (IRS) [Member] | Corporate and Other [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | (1,300,000) |
Public Service Company of New Mexico [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Decrease in regulatory liabilities due to change in state corporate tax rate |  | (1,903,000) | (5,106,000) |
Decrease in income tax expense due to tax rate change |  | (470,000) | (312,000) |
Increase in regulatory liabilities due to change in state corporate tax rate |  |  |  | 23,896,000
Increase in income tax expense due to change in state corporate tax rate |  |  |  | 0
State tax credit carryforwards, impairments |  | 0 | 0 | 0
State net operating loss carryforward, impairment |  | 3,619,000 | 2,145,000 |
Charitable contribution carryforward, Impairment |  | 0 |  |
State tax credit carryforwards, reserve balances |  | 0 | 0 |
State net operating loss carryforwards, reserve balances |  | 248,000 | 2,145,000 |
Charitable contribution carryforwards, reserve balances |  | 0 |  |
Total refunds | $ 77,400,000 |  |  |
Income tax expense (benefit) |  | (12,758,000) | 52,633,000 | 48,804,000
Public Service Company of New Mexico [Member] | Adjustments for New Accounting Pronouncement [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Amounts reclassified |  | 12,400,000 |  |
Public Service Company of New Mexico [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | 1,100,000 |
Texas-New Mexico Power Company [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Decrease in regulatory liabilities due to change in state corporate tax rate |  | 0 | 0 |
Decrease in income tax expense due to tax rate change |  | 0 | 0 |
Increase in regulatory liabilities due to change in state corporate tax rate |  |  |  | 0
Increase in income tax expense due to change in state corporate tax rate |  |  |  | 0
State tax credit carryforwards, impairments |  | 0 | 0 | 0
State net operating loss carryforward, impairment |  | 0 | 0 |
Charitable contribution carryforward, Impairment |  | 0 |  |
State tax credit carryforwards, reserve balances |  | 0 | 0 |
State net operating loss carryforwards, reserve balances |  | 0 | 0 |
Charitable contribution carryforwards, reserve balances |  | 0 |  |
Income tax expense (benefit) |  | 24,125,000 | 22,523,000 | $ 17,621,000
Texas-New Mexico Power Company [Member] | Adjustments for New Accounting Pronouncement [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Amounts reclassified |  | $ 6,400,000 |  |
Texas-New Mexico Power Company [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | $ 0 |

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