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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, 2012 $ 1,689,030 $ 1,182,819 $ (81,630) $ 506,998 $ 1,608,187 $ 80,843 $ 1,334,906 $ 1,061,776 $ (81,414) $ 273,701 $ 1,254,063 $ 80,843          
Balance TNMP at Dec. 31, 2012 1,608,187           1,254,063           463,814 64 390,366 (216) 73,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Proceeds from stock option exercise 3,500 3,500 0 0 3,500 0                      
Awards of common stock (12,429) (12,429) 0 0 (12,429) 0                      
Excess tax (shortfall) from stock-based payment arrangements (519) (519) 0 0 (519) 0                      
Stock based compensation expense 4,315 4,315 0 0 4,315 0                      
Valencia's transactions with its owner (13,477) 0 0 0 0 (13,477) (13,477) 0 0 0 0 (13,477)          
Net Earnings 92,859           85,516           22,170 0 0 0 22,170
Net earnings before subsidiary preferred stock dividends 104,159 0 0 93,255 93,255 10,904 96,420 0 0 85,516 85,516 10,904          
Subsidiary preferred stock dividends (396) 0 0 (396) (396) 0                      
Total other comprehensive income (loss) 8,704 0 8,704 0 8,704 0 8,841 0 8,841 0 8,841 0 (137) 0 0 (137) 0
Dividends declared on preferred stock             (396) 0 0 (396) (396) 0          
Dividends declared on common stock (39,428) 0 0 (39,428) (39,428) 0 (68,028) 0 0 (68,028) (68,028) 0 (3,726) 0 0 0 (3,726)
Balance TNMP at Sep. 30, 2013 1,665,189           1,279,996           482,121 64 390,366 (353) 92,044
Balance at Sep. 30, 2013 1,743,459 1,177,686 (72,926) 560,429 1,665,189 78,270 1,358,266 1,061,776 (72,573) 290,793 1,279,996 78,270          
Balance at Jun. 30, 2013                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net Earnings 54,555           47,823           10,106        
Net earnings before subsidiary preferred stock dividends 58,814           51,950                    
Subsidiary preferred stock dividends (132)                                
Total other comprehensive income (loss) 5,668           5,871           (203)        
Balance TNMP at Sep. 30, 2013 1,665,189           1,279,996           482,121        
Balance at Sep. 30, 2013 $ 1,743,459           $ 1,358,266