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Regulatory and Rate Matters - New Mexico General Rate Cases (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 24 Months Ended
Feb. 01, 2018
Jan. 10, 2018
USD ($)
Dec. 07, 2016
USD ($)
Sep. 28, 2016
USD ($)
lease
MW
Aug. 31, 2016
USD ($)
lease
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
May 16, 2019
MW
Sep. 30, 2016
MW
Jan. 31, 2016
MW
Public Utilities, General Disclosures [Line Items]                            
Income taxes (benefit)           $ 20,636 $ (25,282) $ 7,775            
Regulatory disallowances and restructuring costs           1,098 151,095 65,598            
Percent of non-fuel revenue requirement change implemented 50.00%                          
NMPRC                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase (decrease)     $ 99,200                      
Requested return on equity     10.125%                      
Proposed term for providing benefits to customers related to reduction in state corporate tax                 23 years          
Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Income taxes (benefit)           21,857 (25,962) (5,971)            
Regulatory disallowances and restructuring costs           1,098 150,599 66,339            
Public Service Company of New Mexico | Palo Verde Nuclear Generating Station, Unit 2 Leases                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW       64.1 64.1               64.1 64.1
Number of megawatts (in megawatts) | MW       114.6 114.6               114.6  
Number of leases under which assets were purchased | lease       3 3                  
Public Service Company of New Mexico | Palo Verde Nuclear Generating Station, Unit 1 Leases, extended                            
Public Utilities, General Disclosures [Line Items]                            
Estimated annual rent expense         $ 18,100                  
Public Service Company of New Mexico | NMPRC                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase (decrease)   $ 10,300                        
Requested return on equity   9.575%                        
Proposed term for providing benefits to customers related to reduction in state corporate tax   3 years                        
Public Service Company of New Mexico | 2015 Electric Rate Case                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase (decrease)                   $ 123,500        
Approved rate increase (decrease)       $ 61,200                    
Public Service Company of New Mexico | 2015 Electric Rate Case | Palo Verde Nuclear Generating Station, Unit 2 Leases                            
Public Utilities, General Disclosures [Line Items]                            
Proposed disallowance of recovery of purchase price of assets         $ 163,300                  
Approved lease acquisition costs       83,700                    
Disallowed leasehold improvements       $ 43,800                    
Public Service Company of New Mexico | 2015 Electric Rate Case | Non-Fuel Energy                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase (decrease)                   $ 121,700        
Four Corners                            
Public Utilities, General Disclosures [Line Items]                            
Regulatory disallowances and restructuring costs   $ 47,600                        
Pre-tax regulatory disallowance   $ 148,100                        
Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW         64.1                  
Number of megawatts (in megawatts) | MW         114.6             114.6    
Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico | 2015 Electric Rate Case                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW                       64.1    
Pre-tax regulatory disallowance for capital costs               $ 4,000 $ 3,100   $ 18,400      
New Mexico 2015 Rate Case | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Recorded pre-tax impairments             150,600              
Amount of impairment to carrying amount of regulatory assets             39,700              
Income taxes (benefit)           $ 45,700 $ (45,700)              
New Mexico 2015 Rate Case | Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW             64.1              
Recorded pre-tax impairments portion of purchase price             $ 73,200              
Income taxes (benefit)             (45,700)              
Leaseholds and Leasehold Improvements | New Mexico 2015 Rate Case | Palo Verde Nuclear Generating Station, Units 1 And 4 | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Amount of impairment to carrying amount of regulatory assets             $ 37,700