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Variable Interest Entities (Details) (USD $)
 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Public Service Company of New Mexico [Member]
Mar. 31, 2013
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Palo Verde Nuclear Generating Station [Member]
Property Lease Guarantee [Member]
Maximum [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Delta [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Variable Interest Entity, Not Primary Beneficiary [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Valencia [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2013
Valencia [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Valencia [Member]
Public Service Company of New Mexico [Member]
May 30, 2008
Valencia [Member]
Purchased Through May 30, 2028 [Member]
Public Service Company of New Mexico [Member]
MW
Mar. 31, 2014
Delta [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2013
Delta [Member]
Public Service Company of New Mexico [Member]
Variable Interest Entity [Line Items]                                        
Number of mega watts purchased (in megawatts)                                   158    
Long Term Contract For Purchase of Electric Power Fixed Costs                             $ 4,800,000 $ 4,700,000     $ 1,600,000 $ 1,600,000
Long Term Contract For Purchase of Electric Power Variable Charges                             200,000 100,000     200,000 200,000
Variable Interest Entity, Statement Of Operation [Abstract]                                        
Operating revenues                             4,931,000 4,775,000        
Operating expenses                             (1,400,000) (1,571,000)        
Earnings Attributable to non-controlling interest 3,531,000 3,204,000   3,531,000 3,204,000                   3,531,000 3,204,000        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                                        
Current assets 401,030,000   401,539,000 345,261,000   348,502,000                 2,780,000   2,658,000      
Net property, plant and equipment                             74,433,000   75,137,000      
Assets 5,507,026,000 5,370,760,000 5,500,210,000 4,219,635,000   4,227,616,000                 77,213,000   77,795,000      
Current liabilities 312,088,000   492,671,000 156,140,000   357,266,000                 1,022,000   766,000      
Owners' equity - non-controlling interest 76,191,000   77,029,000 76,191,000   77,029,000                 76,191,000   77,029,000      
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, approximate approval period                             15 months          
Operating Leases, Renewal Options After Original Lease Term (in years) 6 years     2 years                                
Operating Leases, Extended Lease Term Option (in years)       6 years                                
Operating Leases, Future Minimum Payments Due             36,500,000                          
Operating leases, future minimum payments due, renewal term                           145,200,000            
Loss Contingency, Range of Possible Loss, Portion Not Accrued                 144,700,000.0                      
Operating Leases, Future Minimum Payments Due, Next Six Months             11,800,000 26,000,000                        
Period of Long Term Contract For Purchase of Electric Power Fixed Costs                                     20 years  
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining                                     37,700,000  
Payments to Acquire Businesses, Gross                   23,000,000                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt                     15,400,000                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt                     3,300,000                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                     23,200,000   23,700,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                     19,700,000   20,300,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                     17,400,000   18,200,000              
Revenues                     1,800,000 1,800,000                
Net earnings $ 12,468,000 $ 10,626,000   $ 7,674,000 $ 11,569,000           $ 300,000 $ 200,000