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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Aug. 01, 2016
USD ($)
Jan. 31, 2016
USD ($)
May 30, 2014
Oct. 08, 2013
USD ($)
Jun. 30, 2016
USD ($)
MW
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
MW
Jun. 30, 2015
USD ($)
Aug. 03, 2016
USD ($)
Jul. 19, 2016
USD ($)
Dec. 31, 2015
USD ($)
Results of Operations                      
Earnings attributable to non-controlling interest         $ 3,744 $ 3,850 $ 7,031 $ 7,231      
Financial Position                      
Current assets         408,871   408,871       $ 385,570
Total assets         6,360,456 5,888,796 6,360,456 5,888,796     6,009,328
Current liabilities         702,916   702,916       641,120
Owners’ equity – non-controlling interest         71,044   71,044       71,407
Public Service Company of New Mexico [Member]                      
Results of Operations                      
Earnings attributable to non-controlling interest         3,744 3,850 7,031 7,231      
Financial Position                      
Current assets         322,781   322,781       357,757
Total assets         4,775,481   4,775,481       4,599,344
Current liabilities         342,695   342,695       316,921
Owners’ equity – non-controlling interest         71,044   71,044       71,407
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member]                      
Variable Interest Entity [Line Items]                      
Accrued lease payments         8,300   8,300       18,400
Public Service Company of New Mexico [Member] | Valencia [Member]                      
Variable Interest Entity [Line Items]                      
Payment for fixed costs         4,800 4,800 9,600 9,600      
Payment for variable costs         400 500 $ 600 600      
Long term contract option to purchase, ownership percentage     50.00% 50.00%     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         5,248 5,251 $ 10,185 10,155      
Operating expenses         (1,504) (1,401) (3,154) (2,924)      
Earnings attributable to non-controlling interest         3,744 $ 3,850 7,031 $ 7,231      
Financial Position                      
Current assets         3,413   3,413       2,588
Net property, plant, and equipment         68,365   68,365       69,784
Total assets         71,778   71,778       72,372
Current liabilities         734   734       965
Owners’ equity – non-controlling interest         $ 71,044   $ 71,044       71,407
Public Service Company of New Mexico [Member] | Valencia [Member] | Purchased Through May 30, 2028 [Member]                      
Variable Interest Entity [Line Items]                      
Number of megawatts purchased (in megawatts) | MW         158   158        
NM Capital [Member] | San Juan Generating Station [Member] | Coal Supply [Member]                      
Variable Interest Entity [Line Items]                      
Loan agreement among several entities   $ 125,000                  
Cash used to support bank letter or credit arrangement                     $ 40,000
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   $ 40,000        
Loan receivable         125,000   125,000        
Interest receivable         $ 1,600   $ 1,600        
Subsequent Event [Member] | NM Capital [Member] | San Juan Generating Station [Member] | Coal Supply [Member]                      
Variable Interest Entity [Line Items]                      
Cash used to support bank letter or credit arrangement                   $ 30,300  
Subsequent Event [Member] | 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                 $ 30,300    
Loan receivable $ 110,000                    
Principal payment and accrued interest received $ (15,000)