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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Earnings Per Share [Abstract]    
Net Earnings (Loss) Attributable to PNMR $ 17,080 $ 16,637
Average Number of Common Shares:    
Outstanding during period 79,654,000 86,673,000
Equivalents from convertible preferred stock (Note 7) 0 4,778,000
Vested awards of restricted stock 200,000 182,000
Average Shares - Basic 79,854,000 91,633,000
Dilutive Effect of Common Stock Equivalents:    
Stock options and restricted stock 621,000 [1] 475,000 [1]
Average Shares - Diluted 80,475,000 92,108,000
Net Earnings Per Share of Common Stock    
Basic (dollars per share) $ 0.21 $ 0.18
Diluted (dollars per share) $ 0.21 $ 0.18
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares) 1,360,568  
[1] Excludes the effect of out-of-the-money options for 1,360,568 shares of common stock at March 31, 2012.