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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings Per Share [Abstract]                      
Earnings (loss) from continuing operations                 $ 190,934 $ (31,124) $ 65,933
Earnings from continuing operations attributable to Valencia Non-controlling Interest                 (14,047) (13,563) (11,890)
Preferred stock dividend requirements of subsidiary                 (528) (528) (528)
Earnings (loss) from continuing operations attributable to PNMR                 176,359 (45,215) 53,515
Earnings from discontinued operations                 0 0 70,801
Net Earnings (Loss) Attributable to Company $ 111,993 $ 43,662 $ 4,067 $ 16,637 $ (108,196) $ 48,552 $ 22,878 $ (8,449) $ 176,359 $ (45,215) $ 124,316
Average Number of Common Shares:                      
Outstanding during year (in shares)                 85,558 86,673 86,634
Equivalents from convertible preferred stock (in shares)                 3,469 4,778 4,778
Vested awards of restricted stock (in shares)                 174 106 23
Average Shares - Basic (in shares)                 89,201 91,557 91,435
Dilutive Effect of Common Stock Equivalents:                      
Stock options and restricted stock (in shares)                 556 [1] 0 [1] 236 [1]
Average Shares – Diluted (in shares)                 89,757 [1] 91,557 [1] 91,671 [1]
Per Share of Common Stock – Basic:                      
Earnings (loss) from continuing operations (in dollars per share)                 $ 1.98 $ (0.49) $ 0.58
Earnings from discontinued operations (in dollars per share)                 $ 0.00 $ 0.00 $ 0.78
Net Earnings (Loss) (dollars per share) $ 1.36 $ 0.48 $ 0.04 $ 0.18 $ (1.18) $ 0.53 $ 0.25 $ (0.09) $ 1.98 $ (0.49) $ 1.36
Per Share of Common Stock – Diluted:                      
Earnings (loss) from continuing operations (in dollars per share)                 $ 1.96 $ (0.49) $ 0.58
Earnings from discontinued operations (in dollars per share)                 $ 0.00 $ 0.00 $ 0.78
Net Earnings (Loss) (dollars per share) $ 1.35 $ 0.48 $ 0.04 $ 0.18 $ (1.18) $ 0.53 $ 0.25 $ (0.09) $ 1.96 $ (0.49) $ 1.36
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)                 1,591,648    
[1] Excludes out-of-the-money options for 1,591,648 shares of common stock at December 31, 2011. Due to losses in the year ended December 31, 2010, no potentially dilutive securities are reflected in the average number of common shares used to compute earnings (loss) per share since any impact would be anti-dilutive. See Note 13.