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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 53,709 $ 57,489 $ 71,288 $ 42,229
Average Number of Common Shares:        
Outstanding during period (in shares) 85,835 79,654 85,835 79,654
Vested awards of restricted stock (in shares) 231 186 227 202
Average Shares – Basic (in shares) 86,066 79,840 86,062 79,856
Dilutive Effect of Common Stock Equivalents:        
PNMR 2020 Forward Equity Sale Agreements (in shares) 0 0 0 86
Restricted stock (in shares) 41 36 40 37
Average Shares – Diluted (in shares) 86,107 79,876 86,102 79,979
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 0.62 $ 0.72 $ 0.83 $ 0.53
Diluted (in dollars per share) $ 0.62 $ 0.72 $ 0.83 $ 0.53