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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR									$ 85,642	$ 79,874	$ 116,849
Average Number of Common Shares:
Outstanding during year (in shares)									79,654	79,654	79,654
Vested awards of restricted stock (in shares)									236	237	104
Average Shares – Basic (in shares)									79,890	79,891	79,758
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)									122	250	374
Average Shares – Diluted (in shares)									80,012	80,141	80,132
Net Earnings Attributable to PNMR Per Share of Common Stock:
Basic (in dollars per share)	$ (0.70)	$ 1.10	$ 0.48	$ 0.19	$ (0.68)	$ 0.92	$ 0.47	$ 0.29	$ 1.07	$ 1.00	$ 1.47
Diluted (in dollars per share)	$ (0.69)	$ 1.09	$ 0.48	$ 0.19	$ (0.68)	$ 0.92	$ 0.47	$ 0.29	1.07	1.00	1.46
Dividends Declared per Common Share (in dollars per share)									$ 1.0850	$ 0.9925	$ 0.9025

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