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Income Taxes Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]      
Current federal income tax $ 0 $ (2,015) $ 0
Current state income tax (1,376) (728) (917)
Deferred federal income tax 5,488 59,814 50,044
Deferred state income tax 12,305 14,831 12,578
Amortization of accumulated investment tax credits (1,342) (2,164) (2,192)
Total income taxes (benefit) 15,075 69,738 59,513
Public Service Company of New Mexico [Member]      
Income Taxes [Line Items]      
Current federal income tax (7,934) (2,175) (479)
Current state income tax (1,988) (979) (760)
Deferred federal income tax (6,827) 45,890 42,806
Deferred state income tax 5,333 12,061 9,429
Amortization of accumulated investment tax credits (1,342) (2,164) (2,192)
Total income taxes (benefit) (12,758) 52,633 48,804
Texas-New Mexico Power Company [Member]      
Income Taxes [Line Items]      
Current federal income tax 1,603 35 (4,957)
Current state income tax 1,639 1,939 1,916
Deferred federal income tax 20,904 20,577 20,688
Deferred state income tax (21) (28) (26)
Total income taxes (benefit) $ 24,125 $ 22,523 $ 17,621