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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 57,864 $ 43,662 $ 96,456 $ 64,366
Average Number of Common Shares:        
Outstanding during period 79,654,000 86,673,000 79,654,000 86,673,000
Equivalents from convertible preferred stock (Note 7) 0 4,363,000 0 4,638,000
Vested awards of restricted stock 114,000 164,000 156,000 154,000
Average Shares - Basic 79,768,000 91,200,000 79,810,000 91,465,000
Dilutive Effect of Common Stock Equivalents:        
Stock options and restricted stock 622,000 [1] 542,000 [1] 600,000 [1] 516,000 [1]
Average Shares - Diluted 80,390,000 91,742,000 80,410,000 91,981,000
Net Earnings Per Share of Common Stock        
Basic (dollars per share) $ 0.73 $ 0.48 $ 1.21 $ 0.70
Diluted (dollars per share) $ 0.72 $ 0.48 $ 1.20 $ 0.70
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)     1,108,946  
[1] Excludes the effect of out-of-the-money options for 1,108,946 shares of common stock at September 30, 2012.