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Earnings and Dividends Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net Earnings Attributable to PNMR $ 195,829 $ 172,775 $ 77,362
Average Number of Common Shares:      
Outstanding during year (in shares) 85,835 79,941 79,654
Vested awards of restricted stock (in shares) 235 216 277
Average Shares – Basic (in shares) 86,070 80,157 79,931
Dilutive Effect of Common Stock Equivalents:      
PNMR 2020 Forward Equity Sale Agreements (in shares) 0 106 0
Stock options and restricted stock (in shares) 41 40 59
Average Shares – Diluted (in shares) 86,111 80,303 79,990
Net Earnings Attributable to PNMR Per Share of Common Stock:      
Basic (in dollars per share) $ 2.28 $ 2.16 $ 0.97
Diluted (in dollars per share) 2.27 2.15 0.97
Dividends Declared per Common Share (in dollars per share) $ 1.3300 $ 1.2500 $ 1.1775