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Earnings and Dividends Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Earnings Attributable to PNMR $ (91,418) $ 61,045 $ 31,673 $ 14,340 $ 18,992 $ 55,653 $ 29,141 $ 12,468 $ 15,640 $ 116,254 $ 100,507
Average Number of Common Shares:                      
Outstanding during year (in shares)                 79,654,000 79,654,000 79,654,000
Vested awards of restricted stock (in shares)                 105,000 134,000 191,000
Average Shares – Basic (in shares)                 79,759,000 79,788,000 79,845,000
Dilutive Effect of Common Stock Equivalents:                      
Stock options and restricted stock (in shares)                 380,000 491,000 586,000
Average Shares – Diluted (in shares)                 80,139,000 80,279,000 80,431,000
Net Earnings Per Share of Common Stock:                      
Basic (dollars per share) $ (1.15) $ 0.77 $ 0.40 $ 0.18 $ 0.24 $ 0.70 $ 0.37 $ 0.16 $ 0.20 $ 1.46 $ 1.26
Diluted (dollars per share) $ (1.15) $ 0.76 $ 0.40 $ 0.18 $ 0.24 $ 0.69 $ 0.36 $ 0.16 0.20 1.45 1.25
Dividends Declared per Common Share (in dollars per share)                 $ 0.82 $ 0.755 $ 0.68
Shares of common stock (in shares)                 2,100