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Variable Interest Entities (Details)
 3 Months Ended 9 Months Ended
Jan. 31, 2016
USD ($)
MW
May 30, 2014
Oct. 08, 2013
USD ($)
Sep. 30, 2016
USD ($)
MW
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
MW
Sep. 30, 2015
USD ($)
Nov. 01, 2016
USD ($)
Oct. 21, 2016
USD ($)
Aug. 31, 2016
USD ($)
Aug. 30, 2016
USD ($)
Aug. 01, 2016
USD ($)
Jul. 19, 2016
USD ($)
Jan. 15, 2016
lease
MW
Dec. 31, 2015
USD ($)
Jan. 15, 2015
lease
Results of Operations                                
Earnings attributable to non-controlling interest       $ 4,006,000 $ 3,678,000 $ 11,037,000 $ 10,909,000                  
Financial Position                                
Current assets       398,886,000   398,886,000                 $ 385,570,000  
Total assets       6,403,670,000 6,012,582,000 6,403,670,000 6,012,582,000               6,009,328,000  
Current liabilities       701,826,000   701,826,000                 641,120,000  
Owners’ equity – non-controlling interest       70,117,000   70,117,000                 71,407,000  
Public Service Company of New Mexico [Member]                                
Results of Operations                                
Earnings attributable to non-controlling interest       4,006,000 3,678,000 11,037,000 10,909,000                  
Financial Position                                
Current assets       310,645,000   310,645,000                 357,757,000  
Total assets       4,799,012,000   4,799,012,000                 4,599,344,000  
Current liabilities       275,983,000   275,983,000                 316,921,000  
Owners’ equity – non-controlling interest       70,117,000   70,117,000                 71,407,000  
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member]                                
Variable Interest Entity [Line Items]                                
Other financial obligations due to beneficial owner       0   0                    
Recourse available for creditors of trusts other than contractual lease payments       0   0                    
Additional rights to assets beyond use of leased assets       0   0                    
Assets related to the trusts other than accrued lease payments       0   0                 0  
Liabilities related to the trusts other than accrued lease payments       0   0                 0  
Accrued lease payments       3,800,000   3,800,000                 18,400,000  
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member]                                
Variable Interest Entity [Line Items]                                
Number of leases, expiring | lease                               4
Number of leases under which lease term was extended | lease                               4
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member]                                
Variable Interest Entity [Line Items]                                
Number of megawatts purchased (in megawatts) | MW 64.1                         64.1    
Number of leases, expiring | lease                           4    
Number of leases under which lease term was extended | lease                           1    
Number of leases under which assets were purchased | lease                           3    
Public Service Company of New Mexico [Member] | Valencia [Member]                                
Variable Interest Entity [Line Items]                                
Payment for fixed costs       4,900,000 4,900,000 14,500,000 14,500,000                  
Payment for variable costs       500,000 300,000 $ 1,100,000 900,000                  
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     $ 85,000,000                          
Long-term contract option to purchase, approximate approval period           15 months                    
Results of Operations                                
Operating revenues       5,356,000 5,182,000 $ 15,541,000 15,337,000                  
Operating expenses       (1,350,000) (1,504,000) (4,504,000) (4,428,000)                  
Earnings attributable to non-controlling interest       4,006,000 $ 3,678,000 11,037,000 $ 10,909,000                  
Financial Position                                
Current assets       3,506,000   3,506,000                 2,588,000  
Net property, plant, and equipment       67,656,000   67,656,000                 69,784,000  
Total assets       71,162,000   71,162,000                 72,372,000  
Current liabilities       1,045,000   1,045,000                 965,000  
Owners’ equity – non-controlling interest       $ 70,117,000   $ 70,117,000                 71,407,000  
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 $ 125,000,000                              
Cash used to support bank letter or credit arrangement                         $ 30,300,000   $ 40,000,000  
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                   $ 30,300,000 $ 40,000,000          
Loan receivable $ 125,000,000     $ 110,000,000   $ 110,000,000                    
Scheduled principal payment proceeds                       $ 15,000,000        
Interest receivable       $ 1,500,000   $ 1,500,000                    
NM Capital [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member] | Subsequent event [Member]                                
Variable Interest Entity [Line Items]                                
Scheduled principal payment proceeds               $ 15,000,000                
Scheduled interest payment proceeds               $ 2,300,000                
Unaffiliated third party [Member] | San Juan Coal Company, Westmoreland [Member] | Coal Supply [Member] | Subsequent event [Member]                                
Variable Interest Entity [Line Items]                                
Amount held in a restricted bank account                 $ 17,300,000