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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]        
Net Earnings (Loss) Attributable to PNMR $ 21,512 $ 4,067 $ 38,592 $ 20,704
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 4,778,000 0 4,778,000
Vested awards of restricted stock 154,000 139,000 177,000 149,000
Average Shares - Basic 79,808,000 91,590,000 79,831,000 91,600,000
Dilutive Effect of Common Stock Equivalents:        
Stock options and restricted stock 558,000 [1] 546,000 [1] 590,000 [1] 502,000 [1]
Average Shares - Diluted 80,366,000 92,136,000 80,421,000 92,102,000
Net Earnings Per Share of Common Stock        
Basic (dollars per share) $ 0.27 $ 0.04 $ 0.48 $ 0.23
Diluted (dollars per share) $ 0.27 $ 0.04 $ 0.48 $ 0.22
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)     1,356,468  
[1] Excludes the effect of out-of-the-money options for 1,356,468 shares of common stock at June 30, 2012.