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Variable Interest Entities (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Valencia [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Valencia [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Valencia [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Valencia [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Valencia [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Palo Verde Nuclear Generating Station [Member]
Property Lease Guarantee [Member]
Maximum [Member]
Public Service Company of New Mexico [Member]
May 30, 2008
Purchased Through May 30, 2028 [Member]
Valencia [Member]
Public Service Company of New Mexico [Member]
MW
Dec. 31, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Variable Interest Entity [Line Items]                                                    
Number of mega watts purchased (in megawatts)                                             145      
Long Term Contract For Purchase of Electric Power Fixed Costs                     $ 4,800,000 $ 4,800,000 $ 14,100,000 $ 14,000,000   $ 1,600,000 $ 1,600,000 $ 4,800,000 $ 4,700,000              
Long Term Contract For Purchase of Electric Power Variable Charges                     700,000 600,000 1,000,000 900,000   700,000 300,000 1,300,000 600,000              
Variable Interest Entity, Statement Of Operation [Abstract]                                                    
Operating revenues                     5,453,000 5,358,000 15,150,000 14,916,000                        
Operating expenses                     (1,326,000) (1,378,000) (4,246,000) (4,217,000)                        
Earnings Attributable to non-controlling interest 4,127,000 3,980,000 10,904,000 10,699,000   4,127,000 3,980,000 10,904,000 10,699,000   4,127,000 3,980,000 10,904,000 10,699,000                        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                                                    
Current assets 400,520,000   400,520,000   442,191,000 380,216,000   380,216,000   387,689,000 3,457,000   3,457,000   3,655,000                      
Net property, plant and equipment                     75,841,000   75,841,000   77,953,000                      
Assets 5,428,814,000 5,260,207,000 5,428,814,000 5,260,207,000 5,372,583,000 4,192,470,000   4,192,470,000   4,163,907,000 79,298,000   79,298,000   81,608,000                      
Current liabilities 415,593,000   415,593,000   434,103,000 186,272,000   186,272,000   242,751,000 1,028,000   1,028,000   765,000                      
Owners' equity - non-controlling interest 78,270,000   78,270,000   80,843,000 78,270,000   78,270,000   80,843,000 78,270,000   78,270,000   80,843,000                      
Operating Leases, Fixed Rate Percentage of Renewal Options After Original Lease Term               50.00%                                    
Operating Leases, Renewal Options After Original Lease Term (in years)               2 years                                    
Operating Lease, Percentage of Unit 2 Capacity That May Be Extended               14.00%                                    
Operating Leases, Extended Lease Term Option (in years)               6 years                                    
Operating Leases, Future Minimum Payments Due                                       52,600,000            
Loss Contingency, Range of Possible Loss, Portion Not Accrued                                           154,100,000        
Operating Leases, Future Minimum Payments Due, Next Six Months                                       11,800,000 26,000,000          
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining                               40,700,000   40,700,000                
Payments to Acquire Businesses, Gross                                               23,000,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt                                                 16,900,000 16,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt                                                 3,200,000 3,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                                                 25,300,000 25,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                                                 21,000,000 21,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                                                 18,900,000 18,900,000
Revenues                                                 2,800,000 6,800,000
Net Earnings $ 54,555,000 $ 57,864,000 $ 92,859,000 $ 96,456,000   $ 47,823,000 $ 50,911,000 $ 85,516,000 $ 85,607,000                               $ 600,000 $ 900,000
Long term contract option to purchase, ownership percentage                     50.00%                              
Long term contract option to purchase, number of days to set FMV                     60 days                              
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, approximate approval period                     15 months