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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
MW
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Oct. 08, 2013
USD ($)
Results of Operations        
Earnings attributable to non-controlling interest $ 3,287 $ 3,380    
Financial Position        
Current assets 356,961   $ 385,570  
Total assets 6,273,812 5,900,606 6,009,328  
Current liabilities 771,565   641,120  
Owners’ equity – non-controlling interest 70,695   71,407  
Public Service Company of New Mexico [Member]        
Results of Operations        
Earnings attributable to non-controlling interest 3,287 3,380    
Financial Position        
Current assets 291,937   357,757  
Total assets 4,719,346   4,599,344  
Current liabilities 433,796   316,921  
Owners’ equity – non-controlling interest 70,695   71,407  
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member]        
Variable Interest Entity [Line Items]        
Accrued lease payments 3,800   18,400  
Public Service Company of New Mexico [Member] | Valencia [Member]        
Variable Interest Entity [Line Items]        
Payment for fixed costs 4,800 4,800    
Payment for variable costs $ 200 100    
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
Long term contract option to purchase, approximate approval period 15 months      
Results of Operations        
Operating revenues $ 4,937 4,904    
Operating expenses (1,650) (1,524)    
Earnings attributable to non-controlling interest 3,287 $ 3,380    
Financial Position        
Current assets 2,732   2,588  
Net property, plant, and equipment 69,075   69,784  
Total assets 71,807   72,372  
Current liabilities 1,112   965  
Owners’ equity – non-controlling interest $ 70,695   $ 71,407  
Public Service Company of New Mexico [Member] | Valencia [Member] | Purchased Through May 30, 2028 [Member]        
Variable Interest Entity [Line Items]        
Number of mega watts purchased (in megawatts) | MW 158      
NM Capital [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member]        
Variable Interest Entity [Line Items]        
Cash used to support bank letter or credit arrangement $ 40,000      
Loan receivable 125,000      
Interest receivable $ 1,600