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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 31,673 $ 29,141 $ 46,013 $ 41,609
Average Number of Common Shares:        
Outstanding during period 79,654,000 79,654,000 79,654,000 79,654,000
Vested awards of restricted stock 99,000 110,000 105,000 146,000
Average Shares – Basic 79,753,000 79,764,000 79,759,000 79,800,000
Dilutive Effect of Common Stock Equivalents:        
Stock options and restricted stock [1] 380,000 464,000 384,000 508,000
Average Shares – Diluted 80,133,000 80,228,000 80,143,000 80,308,000
Net Earnings Per Share of Common Stock:        
Basic (dollars per share) $ 0.40 $ 0.37 $ 0.58 $ 0.52
Diluted (dollars per share) $ 0.40 $ 0.36 $ 0.57 $ 0.52
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)     245,950  
[1] Excludes the effect of out-of-the-money options for 245,950 shares of common stock at June 30, 2015.