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Condensed Consolidated Statements of Changes in Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
AOCI [Member]
Retained Earnings [Member]
Total Company Common Stockholders' Equity [Member]
Non-controlling Interest in Valencia [Member]
Public Service Company of New Mexico [Member]
Public Service Company of New Mexico [Member]
Common Stock [Member]
Public Service Company of New Mexico [Member]
AOCI [Member]
Public Service Company of New Mexico [Member]
Retained Earnings [Member]
Public Service Company of New Mexico [Member]
Total Company Common Stockholders' Equity [Member]
Public Service Company of New Mexico [Member]
Non-controlling Interest in Valencia [Member]
Texas-New Mexico Power Company [Member]
Texas-New Mexico Power Company [Member]
Common Stock [Member]
Texas-New Mexico Power Company [Member]
Additional Paid-in Capital [Member]
Texas-New Mexico Power Company [Member]
AOCI [Member]
Texas-New Mexico Power Company [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2011 $ 1,656,408 $ 1,193,191 $ (66,856) $ 447,650 $ 1,573,985 $ 82,423 $ 1,294,512 $ 1,061,776 $ (66,798) $ 217,111 $ 1,212,089 $ 82,423          
Balance TNMP at Dec. 31, 2011 1,573,985           1,212,089           463,253 64 416,394 (58) 46,853
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Proceeds from stock option exercise 10,301 10,301 0 0 10,301 0                      
Purchases to satisfy awards of common stock (21,930) (21,930) 0 0 (21,930) 0                      
Excess tax (shortfall) from stock-based payment arrangements (424) (424) 0 0 (424) 0                      
Stock based compensation expense 2,748 2,748 0 0 2,748 0                      
Valencia's transactions with its owner (12,034) 0 0 0 0 (12,034) (12,034) 0 0 0 0 (12,034)          
Net Earnings 96,456           85,607           20,113 0 0 0 20,113
Net earnings before subsidiary preferred stock dividends 107,551 0 0 96,852 96,852 10,699 96,306 0 0 85,607 85,607 10,699          
Subsidiary preferred stock dividends (396) 0 0 (396) (396) 0                      
Total other comprehensive income (loss) 5,998 0 5,998 0 5,998 0 6,183 0 6,183 0 6,183 0 (185) 0 0 (185) 0
Dividends declared on preferred stock             (396) 0 0 (396) (396) 0          
Dividends declared on common stock (34,650) 0 0 (34,650) (34,650) 0 (34,433) 0 0 (34,433) (34,433) 0 (11,028) 0 (11,028) 0 0
Balance TNMP at Sep. 30, 2012 1,632,484           1,269,050           472,153 64 405,366 (243) 66,966
Balance at Sep. 30, 2012 1,713,572 1,183,886 (60,858) 509,456 1,632,484 81,088 1,350,138 1,061,776 (60,615) 267,889 1,269,050 81,088          
Balance at Jun. 30, 2012                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net Earnings 57,864           50,911           9,084        
Net earnings before subsidiary preferred stock dividends 61,976           54,891                    
Subsidiary preferred stock dividends (132)                                
Total other comprehensive income (loss) 1,770           1,833           (63)        
Balance TNMP at Sep. 30, 2012 1,632,484           1,269,050           472,153        
Balance at Sep. 30, 2012 $ 1,713,572           $ 1,350,138