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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net Earnings Available for PNM Common Stock	$ 87,521	$ 73,739	$ 140,719	$ 134,156
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)	215	284	210	215
Average Shares – Basic (in shares)	79,869	79,938	79,864	79,869
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)	111	216	126	263
Average Shares – Diluted (in shares)	79,980	80,154	79,990	80,132
Net Earnings Per Share of Common Stock:
Basic (in dollars per share)	$ 1.10	$ 0.92	$ 1.76	$ 1.68
Diluted (in dollars per share)	$ 1.09	$ 0.92	$ 1.76	$ 1.67

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