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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 ($)
lease
MW
Aug. 27, 2015
USD ($)
Aug. 31, 2019
Aug. 31, 2016
USD ($)
lease
MW
Dec. 31, 2019
USD ($)
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
May 16, 2019
MW
Dec. 31, 2016
MW
Sep. 30, 2016
MW
Jan. 31, 2016
MW
Public Utilities, General Disclosures [Line Items]                              
Income taxes (benefit)               $ (25,282) $ 7,775 $ 130,340          
Regulatory disallowances and restructuring costs               151,095 $ 65,598 27,036          
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)               (25,962) $ (5,971) 81,555          
Regulatory disallowances and restructuring costs               150,599 66,339 27,036          
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       3 years                  
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 | 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         114.6 114.6    
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              
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       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