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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 61,045 $ 55,653 $ 107,058 $ 97,262
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 100,000 112,000 103,000 134,000
Average Shares – Basic 79,754,000 79,766,000 79,757,000 79,788,000
Dilutive Effect of Common Stock Equivalents:        
Stock options and restricted stock [1] 362,000 457,000 377,000 491,000
Average Shares – Diluted 80,116,000 80,223,000 80,134,000 80,279,000
Net Earnings Per Share of Common Stock:        
Basic (dollars per share) $ 0.77 $ 0.70 $ 1.34 $ 1.22
Diluted (dollars per share) $ 0.76 $ 0.69 $ 1.34 $ 1.21
Out-of-the-money options for shares of common stock     244,900  
[1] Excludes the effect of out-of-the-money options for 244,900 shares of common stock at September 30, 2015.