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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Earnings Available for PNM Common Stock		$ 102,771	$ 87,521	$ 45,557	$ 140,719
Average Number of Common Shares:
Outstanding during period (in shares)		79,654	79,654	79,654	79,654
Vested awards of restricted stock (in shares)	[1]	294	215	265	210
Average Shares – Basic (in shares)		79,948	79,869	79,919	79,864
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)		53	111	61	126
Average Shares – Diluted (in shares)		80,001	79,980	79,980	79,990
Net Earnings Per Share of Common Stock:
Basic (in dollars per share)		$ 1.29	$ 1.10	$ 0.57	$ 1.76
Diluted (in dollars per share)		$ 1.28	$ 1.09	$ 0.57	$ 1.76
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