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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 6,455 $ 15,031 $ 19,889
Additions based on tax positions 242 1,214 623
Additions (reductions) for tax positions of prior years   (9,790) (5,481)
Additions (reductions) for tax positions of prior years 55    
Settlement payments 0 0 0
Ending balance 6,752 6,455 15,031
Public Service Company of New Mexico [Member]      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 3,652 12,228 11,073
Additions based on tax positions 242 1,214 623
Additions (reductions) for tax positions of prior years   (9,790)  
Additions (reductions) for tax positions of prior years 55   532
Settlement payments 0 0 0
Ending balance 3,949 3,652 12,228
Unrecognized tax benefits that would impact effective tax rate 3,400    
Texas-New Mexico Power Company [Member]      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 0 0 6,796
Additions based on tax positions 0 0 0
Additions (reductions) for tax positions of prior years   0 (6,796)
Additions (reductions) for tax positions of prior years 0    
Settlement payments 0 0 0
Ending balance 0 $ 0 $ 0
PNMR [Member]      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits that would impact effective tax rate $ 6,200