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Variable Interest Entities (Details)
 1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 17, 2014
USD ($)
Sep. 30, 2015
USD ($)
MW
Sep. 30, 2014
USD ($)
Jul. 17, 2014
USD ($)
Sep. 30, 2015
USD ($)
MW
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Oct. 08, 2013
USD ($)
Variable Interest Entity, Statement Of Operation [Abstract]                
Earnings attributable to non-controlling interest   $ 3,678,000 $ 3,701,000   $ 10,909,000 $ 11,140,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Current assets   407,985,000     407,985,000   $ 432,817,000  
Total assets   6,052,852,000 5,709,209,000   6,052,852,000 5,709,209,000 5,829,325,000  
Current liabilities   518,587,000     518,587,000   704,282,000  
Owners’ equity – non-controlling interest   72,348,000     $ 72,348,000   73,546,000  
Public Service Company of New Mexico [Member]                
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Option to renew leases at fixed rate, number of years         2 years      
Option to extend period on certain leases, number of years         6 years      
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member]                
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Operating Leases, Future Minimum Payments Due, Next Twelve Months   8,400,000     $ 8,400,000   26,000,000  
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] | Property Lease Guarantee [Member] | Maximum [Member]                
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Loss contingency, range of possible loss, portion not accrued   205,800,000.0     205,800,000.0      
Public Service Company of New Mexico [Member] | Valencia [Member]                
Variable Interest Entity, Statement Of Operation [Abstract]                
Operating revenues   5,182,000 5,061,000   15,337,000 15,300,000    
Operating expenses   (1,504,000) (1,360,000)   (4,428,000) (4,160,000)    
Earnings attributable to non-controlling interest   3,678,000 3,701,000   10,909,000 11,140,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Current assets   3,410,000     3,410,000   2,513,000  
Net property, plant, and equipment   70,471,000     70,471,000   72,321,000  
Total assets   73,881,000     73,881,000   74,834,000  
Current liabilities   1,533,000     1,533,000   1,288,000  
Owners’ equity – non-controlling interest   72,348,000     72,348,000   $ 73,546,000  
Payment for fixed costs   4,900,000 4,800,000   14,500,000 14,400,000    
Payment for variable costs   $ 300,000 $ 300,000   $ 900,000 $ 1,000,000    
Long term contract option to purchase, ownership percentage   50.00%            
Long term contract option to purchase, purchase price - percentage of adjusted NBV   50.00%            
Long term contract option to purchase, purchase price - percentage of FMV   50.00%            
Long term contract option to purchase, number of days to set FMV   60 days            
Long term contract option to purchase, estimated purchase price               $ 85,000,000
Long term contract option to purchase, approximate approval period   15 months            
Public Service Company of New Mexico [Member] | Valencia [Member] | Purchased Through May 30, 2028 [Member]                
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Number of mega watts purchased (in megawatts) | MW   158     158      
Public Service Company of New Mexico [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Operating leases, future minimum payments due, renewal term   $ 140,100,000     $ 140,100,000      
Public Service Company of New Mexico [Member] | Delta [Member]                
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                
Payment for fixed costs $ 300,000     $ 3,500,000        
Payment for variable costs $ 100,000     $ 600,000        
Period of long term contract for purchase of electric power fixed costs         20 years