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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 5,410 5,410 0 0 5,410 0                      
Purchases to satisfy awards of common stock (12,674) (12,674) 0 0 (12,674) 0                      
Excess tax (shortfall) from stock-based payment arrangements (377) (377) 0 0 (377) 0                      
Stock based compensation expense 1,435 1,435 0 0 1,435 0                      
Valencia's transactions with its owner (7,449) 0 0 0 0 (7,449) (7,449) 0 0 0 0 (7,449)          
Net Earnings 38,592           34,697           11,029 0 0 0 11,029
Net earnings before subsidiary preferred stock dividends 45,576 0 0 38,856 38,856 6,720 41,417 0 0 34,697 34,697 6,720          
Subsidiary preferred stock dividends (264) 0 0 (264) (264) 0                      
Total other comprehensive income (loss) 4,228 0 4,228 0 4,228 0 4,350 0 4,350 0 4,350 0 (122) 0 0 (122) 0
Dividends declared on preferred stock             (264) 0 0 (264) (264) 0          
Dividends declared on common stock (11,550) 0 0 (11,550) (11,550) 0 (17,680) 0 0 (17,680) (17,680) 0 (3,010) 0 (3,010) 0 0
Balance TNMP at Jun. 30, 2012 1,599,049           1,233,192           471,150 64 413,384 (180) 57,882
Balance at Jun. 30, 2012 1,680,743 1,186,985 (62,628) 474,692 1,599,049 81,694 1,314,886 1,061,776 (62,448) 233,864 1,233,192 81,694          
Balance at Mar. 31, 2012                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net Earnings 21,512           16,885           8,018        
Net earnings before subsidiary preferred stock dividends 25,099           20,340                    
Subsidiary preferred stock dividends (132)                                
Total other comprehensive income (loss) (2,322)           (2,279)           (43)        
Balance TNMP at Jun. 30, 2012 1,599,049           1,233,192           471,150        
Balance at Jun. 30, 2012 $ 1,680,743           $ 1,314,886