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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]      
Current federal income tax $ 0 $ 0 $ 0
Current state income tax (188) (527) (1,376)
Deferred federal income tax 119,182 60,892 5,488
Deferred state income tax 11,632 3,886 12,305
Amortization of accumulated investment tax credits (286) (973) (1,342)
Total income taxes (benefit) 130,340 63,278 15,075
Public Service Company of New Mexico      
Income Taxes [Line Items]      
Current federal income tax 118 (10,290) (7,934)
Current state income tax (1,112) (1,907) (1,988)
Deferred federal income tax 73,308 49,123 (6,827)
Deferred state income tax 9,527 4,969 5,333
Amortization of accumulated investment tax credits (286) (973) (1,342)
Total income taxes (benefit) 81,555 40,922 (12,758)
Texas-New Mexico Power Company      
Income Taxes [Line Items]      
Current federal income tax 2,472 9,445 1,603
Current state income tax 1,765 1,729 1,639
Deferred federal income tax 27,304 12,690 20,904
Deferred state income tax (29) (28) (21)
Total income taxes (benefit) $ 31,512 $ 23,836 $ 24,125