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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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