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Variable Interest Entities (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Public Service Company of New Mexico [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Mar. 31, 2013
Valencia [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2012
Valencia [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Valencia [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 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]
Mar. 31, 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
Mar. 31, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
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             $ 4,700,000     $ 1,600,000 $ 1,500,000            
Long Term Contract For Purchase of Electric Power Variable Charges             100,000 100,000   200,000 100,000            
Variable Interest Entity, Statement Of Operation [Abstract]                                  
Operating revenues             4,775,000 4,670,000                  
Operating expenses             (1,571,000) (1,405,000)                  
Earnings Attributable to non-controlling interest 3,204,000 3,265,000   3,204,000 3,265,000   3,204,000 3,265,000                  
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                                  
Current assets 432,074,000   442,191,000 378,627,000   387,689,000 2,691,000   3,655,000                
Net property, plant and equipment             77,245,000   77,953,000                
Assets 5,370,760,000 5,197,896,000 5,372,583,000 4,155,257,000   4,163,907,000 79,936,000   81,608,000                
Current liabilities 494,077,000   434,103,000 276,360,000   242,751,000 1,149,000   765,000                
Owners' equity - non-controlling interest 78,787,000   80,843,000 78,787,000   80,843,000 78,787,000   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 Leases, Extended Lease Term Option (in years)       6 years                          
Operating Leases, Future Minimum Payments Due                       65,900,000          
Loss Contingency, Range of Possible Loss, Portion Not Accrued                           160,400,000      
Operating Leases, Future Minimum Payments Due, Next Six Months                       11,800,000          
Operating Leases, Future Minimum Payments Due, Current                         26,000,000        
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining                   43,700,000              
Payments to Acquire Businesses, Gross                                 23,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt                                 18,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt                                 3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                               26,100,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                               22,400,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                               20,400,000  
Revenues                               1,800,000  
Net Earnings $ 10,626,000 $ 17,080,000   $ 11,569,000 $ 17,812,000                     $ 200,000