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Earnings and Dividends Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR									$ 77,362	$ 85,642	$ 79,874
Average Number of Common Shares:
Outstanding during year (in shares)									79,654	79,654	79,654
Vested awards of restricted stock (in shares)									277	236	237
Average Shares – Basic (in shares)									79,931	79,890	79,891
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)									59	122	250
Average Shares – Diluted (in shares)									79,990	80,012	80,141
Net Earnings Attributable to PNMR Per Share of Common Stock:
Basic (in dollars per share)	$ 0.40	$ 1.29	$ (0.95)	$ 0.23	$ (0.70)	$ 1.10	$ 0.48	$ 0.19	$ 0.97	$ 1.07	$ 1.00
Diluted (in dollars per share)	$ 0.40	$ 1.28	$ (0.95)	$ 0.23	$ (0.69)	$ 1.09	$ 0.48	$ 0.19	0.97	1.07	1.00
Dividends Declared per Common Share (in dollars per share)									$ 1.1775	$ 1.0850	$ 0.9925

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Aggregate dividends declared during the period for each share of common stock outstanding.

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