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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Current federal income tax | $ 0 | $ 0 | $ 0
Current state income tax | (244) | (188) | (527)
Deferred federal income tax | 7,716 | 119,182 | 60,892
Deferred state income tax | 648 | 11,632 | 3,886
Amortization of accumulated investment tax credits | (345) | (286) | (973)
Total income taxes (benefit) | 7,775 | 130,340 | 63,278
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | (6,644) | 118 | (10,290)
Current state income tax | (2,661) | (1,112) | (1,907)
Deferred federal income tax | 5,661 | 73,308 | 49,123
Deferred state income tax | (2,080) | 9,527 | 4,969
Amortization of accumulated investment tax credits | (247) | (286) | (973)
Total income taxes (benefit) | (5,971) | 81,555 | 40,922
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | 13,347 | 2,472 | 9,445
Current state income tax | 1,753 | 1,765 | 1,729
Deferred federal income tax | (540) | 27,304 | 12,690
Deferred state income tax | 2,320 | (29) | (28)
Total income taxes (benefit) | $ 16,880 | $ 31,512 | $ 23,836

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