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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 63,257 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (10,621) |  |
Tax effect of mark-to-market adjustments | 8,379 |  |
Tax effect of excess pension liability | 5,071 |  |
Adjustment for uncertain income tax positions | 297 |  |
Reclassification of unrecognized tax benefits | (297) |  |
Regulatory recovery of prior year impairment of state net operating loss carryforward, net of amortization | (1,877) |  |
Other | (404) |  |
Deferred income taxes | 63,805 | $ 16,451 | $ 72,481
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 52,282 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (10,510) |  |
Tax effect of mark-to-market adjustments | 8,336 |  |
Tax effect of excess pension liability | 5,071 |  |
Adjustment for uncertain income tax positions | 297 |  |
Reclassification of unrecognized tax benefits | (297) |  |
Regulatory recovery of prior year impairment of state net operating loss carryforward, net of amortization | (1,877) |  |
Other | (183) |  |
Deferred income taxes | 53,119 | (2,836) | 55,787
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 12,994 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (111) |  |
Other | (221) |  |
Deferred income taxes | $ 12,662 | $ 20,883 | $ 20,549

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