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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 53,509 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (27,833) |  |
Amortization of excess deferred income tax | (19,779) |  |
Tax effect of mark-to-market adjustments | 380 |  |
Tax effect of excess pension liability | 308 |  |
Adjustment for uncertain income tax positions | 765 |  |
Reclassification of unrecognized tax benefits | (765) |  |
Amortization of state net operating loss recovered in prior years | 1,367 |  |
Federal income tax rate change, including impact on regulatory liabilities | 2,330 |  |
Refundable alternative minimum tax credit carryforward reclassified to receivable | (1,585) |  |
Other | (678) |  |
Deferred income taxes | 8,019 | $ 130,528 | $ 63,805
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 53,755 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (27,833) |  |
Amortization of excess deferred income tax | (19,779) |  |
Tax effect of mark-to-market adjustments | 579 |  |
Tax effect of excess pension liability | 308 |  |
Adjustment for uncertain income tax positions | 725 |  |
Reclassification of unrecognized tax benefits | (725) |  |
Amortization of state net operating loss recovered in prior years | 1,367 |  |
Federal income tax rate change, including impact on regulatory liabilities | (6,250) |  |
Other | 1,187 |  |
Deferred income taxes | 3,334 | 82,549 | 53,119
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 9,823 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (350) |  |
Federal income tax rate change, including impact on regulatory liabilities | (7,761) |  |
Other | 68 |  |
Deferred income taxes | $ 1,780 | $ 27,275 | $ 12,662

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