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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
PNMR      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 9,429 $ 6,752 $ 6,455
Additions based on tax positions 543 262 242
Additions (reductions) for tax positions of prior years 222 2,415 55
Settlement payments 0 0 0
Ending balance 10,194 9,429 6,752
Unrecognized tax benefits that would impact effective tax rate 9,600    
Public Service Company of New Mexico      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 6,563 3,949 3,652
Additions based on tax positions 543 262 242
Additions (reductions) for tax positions of prior years 182 2,352 55
Settlement payments 0 0 0
Ending balance 7,288 6,563 3,949
Unrecognized tax benefits that would impact effective tax rate 6,700    
Texas-New Mexico Power Company      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 63 0
Additions based on tax positions 0 0 0
Additions (reductions) for tax positions of prior years 40 63 0
Settlement payments 0 0 0
Ending balance 103 $ 63 $ 0
Unrecognized tax benefits that would impact effective tax rate $ 100