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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net Earnings (Loss) Attributable to PNMR	$ 17,579	$ (15,260)
Average Number of Common Shares:
Outstanding during period (in shares)	85,835	79,654
Vested awards of restricted stock (in shares)	196	217
Average Shares – Basic (in shares)	86,031	79,871
Dilutive Effect of Common Stock Equivalents:
Restricted stock (in shares)	24	0
Average Shares – Diluted (in shares)	86,055	79,871
Net Earnings (Loss) Per Share of Common Stock:
Basic (in dollars per share)	$ 0.20	$ (0.19)
Diluted (in dollars per share)	$ 0.20	$ (0.19)

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