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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]                      
Earnings (loss)                 $ 120,125 $ 190,934 $ (31,124)
Earnings attributable to Valencia Non-controlling Interest                 (14,050) (14,047) (13,563)
Preferred stock dividend requirements of subsidiary                 (528) (528) (528)
Net Earnings (Loss) Attributable to PNMR $ 9,091 $ 57,864 $ 21,512 $ 17,080 $ 111,993 $ 43,662 $ 4,067 $ 16,637 $ 105,547 $ 176,359 $ (45,215)
Average Number of Common Shares:                      
Outstanding during year                 79,654,000 85,558,000 86,673,000
Equivalents from convertible preferred stock (Note 5)                 0 3,469,000 4,778,000
Vested awards of restricted stock                 145,000 174,000 106,000
Average Shares - Basic                 79,799,000 89,201,000 91,557,000
Dilutive Effect of Common Stock Equivalents:                      
Stock options and restricted stock                 618,000 [1] 556,000 [1] 0 [1]
Average Shares – Diluted                 80,417,000 [1] 89,757,000 [1] 91,557,000 [1]
Net Earnings (Loss) Per Share of Common Stock:                      
Basic (dollars per share) $ 0.11 $ 0.73 $ 0.27 $ 0.21 $ 1.36 $ 0.48 $ 0.04 $ 0.18 $ 1.32 $ 1.98 $ (0.49)
Diluted (dollars per share) $ 0.11 $ 0.72 $ 0.27 $ 0.21 $ 1.35 $ 0.48 $ 0.04 $ 0.18 $ 1.31 $ 1.96 $ (0.49)
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)                 1,214,365    
[1] Excludes out-of-the-money options for 1,214,365 shares of common stock at December 31, 2012. 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.