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Earnings and Dividends Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Earnings Per Share [Abstract] |  |  |
Net Earnings Attributable to PNMR | $ 169,530 | $ 195,829 | $ 172,775
Average Number of Common Shares: |  |  |
Outstanding during year (in shares) | 85,835 | 85,835 | 79,941
Vested awards of restricted stock (in shares) | 287 | 235 | 216
Average Shares – Basic (in shares) | 86,122 | 86,070 | 80,157
Dilutive Effect of Common Stock Equivalents: |  |  |
PNMR 2020 Forward Equity Sale Agreements (in shares) | 0 | 0 | 106
Stock options and restricted stock (in shares) | 47 | 41 | 40
Average Shares – Diluted (in shares) | 86,169 | 86,111 | 80,303
Net Earnings Attributable to PNMR Per Share of Common Stock: |  |  |
Basic (in dollars per share) | $ 1.97 | $ 2.28 | $ 2.16
Diluted (in dollars per share) | 1.97 | 2.27 | 2.15
Dividends Declared per Common Share (in dollars per share) | $ 1.41 | $ 1.33 | $ 1.25

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