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Earnings Per Share (Details) (USD $)
In Thousands, except Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Schedule of Earnings Per Share Basic and Diluted [Line Items]        
Net Earnings Attributable to PNMR $ 4,067 $ 22,878 $ 20,704 $ 14,429
Average Number of Common Shares:        
Outstanding during period 86,673,000 86,673,000 86,673,000 86,673,000
Equivalents from convertible preferred stock 4,778,000 4,778,000 4,778,000 4,778,000
Vested awards of restricted stock 139,000 109,000 149,000 102,000
Average Shares - Basic 91,590,000 91,560,000 91,600,000 91,553,000
Dilutive Effect of Common Stock Equivalents:        
Stock options and restricted stock 546,000 [1] 273,000 [1] 502,000 [1] 141,000 [1]
Average Shares - Diluted 92,136,000 91,833,000 92,102,000 91,694,000
Net Earnings Per Share of Common Stock        
Basic (dollars per share) $ 0.04 $ 0.25 $ 0.23 $ 0.16
Diluted (dollars per share) $ 0.04 $ 0.25 $ 0.22 $ 0.16
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price     1,978,010  
[1] Excludes the effect of out-of-the-money options for 1,978,010 shares of common stock at June 30, 2011.