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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
Current federal income tax | $ 60 | $ 0 | $ 0
Current state income tax | 43 | (244) | (188)
Deferred federal income tax | (20,372) | 7,716 | 119,182
Deferred state income tax | (4,491) | 648 | 11,632
Amortization of accumulated investment tax credits | (522) | (345) | (286)
Total income taxes (benefit) | (25,282) | 7,775 | 130,340
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | (6,266) | (6,644) | 118
Current state income tax | 449 | (2,661) | (1,112)
Deferred federal income tax | (12,308) | 5,661 | 73,308
Deferred state income tax | (7,590) | (2,080) | 9,527
Amortization of accumulated investment tax credits | (247) | (247) | (286)
Total income taxes (benefit) | (25,962) | (5,971) | 81,555
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | 10,792 | 13,347 | 2,472
Current state income tax | 1,904 | 1,753 | 1,765
Deferred federal income tax | (7,621) | (540) | 27,304
Deferred state income tax | (29) | 2,320 | (29)
Total income taxes (benefit) | $ 5,046 | $ 16,880 | $ 31,512

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