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Income Taxes - Federal Income Tax Reform (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 10, 2018
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Income Taxes [Line Items]            
Federal and state excess deferred income taxes     $ 24,500      
Income taxes (benefit)     32,582 $ 20,636 $ (25,282)  
Public Service Company of New Mexico            
Income Taxes [Line Items]            
Federal and state excess deferred income taxes     15,200      
Income taxes (benefit)     26,992 21,857 (25,962)  
TNMP            
Income Taxes [Line Items]            
Federal and state excess deferred income taxes     9,300      
Income taxes (benefit)     $ 7,912 $ 6,308 5,046  
NMPRC            
Income Taxes [Line Items]            
Proposed term for providing benefits to customers related to reduction in state corporate tax   3 years       23 years
NMPRC | Public Service Company of New Mexico            
Income Taxes [Line Items]            
Proposed term for providing benefits to customers related to reduction in state corporate tax 3 years          
New Mexico 2015 Rate Case | Public Service Company of New Mexico            
Income Taxes [Line Items]            
Pre-tax impairment of investments         150,600  
Income taxes (benefit)         $ (45,700)