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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

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