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Income Taxes - Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes, Impairment of Carryforwards      
State tax credit carryforwards $ 1,029 $ (425) $ 425
Compensation expense 119 96 (99)
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 1,029    
Compensation expense 526 407  
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryforwards 196,200    
Federal tax credit carryforwards that expire beginning in 2023 122,400    
Public Service Company of New Mexico      
Income Taxes, Impairment of Carryforwards      
State tax credit carryforwards 0 0 0
Compensation expense 84 61 (100)
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 0    
Compensation expense 343 259  
Texas-New Mexico Power Company      
Income Taxes, Impairment of Carryforwards      
State tax credit carryforwards 0 0 0
Compensation expense 35 35 $ 2
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 0    
Compensation expense $ 182 $ 148