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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 2,293 2,293 0 0 2,293 0                      
Awards of common stock (9,651) (9,651) 0 0 (9,651) 0                      
Excess tax (shortfall) from stock-based payment arrangements (452) (452) 0 0 (452) 0                      
Stock based compensation expense 1,903 1,903 0 0 1,903 0                      
Valencia's transactions with its owner (5,260) 0 0 0 0 (5,260) (5,260) 0 0 0 0 (5,260)          
Net Earnings 10,626           11,569           3,726 0 0 0 3,726
Net earnings before subsidiary preferred stock dividends 13,962 0 0 10,758 10,758 3,204 14,773 0 0 11,569 11,569 3,204          
Subsidiary preferred stock dividends (132) 0 0 (132) (132) 0                      
Total other comprehensive income (loss) 4,939 0 4,939 0 4,939 0 4,900 0 4,900 0 4,900 0 39 0 0 39 0
Dividends declared on preferred stock             (132) 0 0 (132) (132) 0          
Dividends declared on common stock (13,142) 0 0 (13,142) (13,142) 0                      
Balance TNMP at Mar. 31, 2013 1,604,703           1,270,400           467,579 64 390,366 (177) 77,326
Balance at Mar. 31, 2013 $ 1,683,490 $ 1,176,912 $ (76,691) $ 504,482 $ 1,604,703 $ 78,787 $ 1,349,187 $ 1,061,776 $ (76,514) $ 285,138 $ 1,270,400 $ 78,787