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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 25,339 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (10,332) |  |
Amortization of excess deferred income tax | (37,799) |  |
Tax effect of mark-to-market adjustments | (2,261) |  |
Tax effect of excess pension liability | (908) |  |
Adjustment for uncertain income tax positions | 499 |  |
Reclassification of unrecognized tax benefits | (499) |  |
Amortization of state net operating loss recovered in prior years | 1,367 |  |
Refundable alternative minimum tax credit carryforward reclassified to receivable | (576) |  |
Other | (215) |  |
Deferred income taxes (benefits) | (25,385) | $ 8,019 | $ 130,528
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 19,223 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (7,861) |  |
Amortization of excess deferred income tax | (28,923) |  |
Tax effect of mark-to-market adjustments | (2,962) |  |
Tax effect of excess pension liability | (908) |  |
Adjustment for uncertain income tax positions | 488 |  |
Reclassification of unrecognized tax benefits | (488) |  |
Amortization of state net operating loss recovered in prior years | 1,367 |  |
Other | (81) |  |
Deferred income taxes (benefits) | (20,145) | 3,334 | 82,549
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 3,913 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (2,471) |  |
Amortization of excess deferred income tax | (8,876) |  |
Other | (216) |  |
Deferred income taxes (benefits) | $ (7,650) | $ 1,780 | $ 27,275

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