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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ (54,282)	$ 73,739	$ 37,555	$ 22,862	$ 24,809	$ 54,418	$ 27,076	$ 10,546	$ 79,874	$ 116,849	$ 15,640
Average Number of Common Shares:
Outstanding during year (in shares)									79,654	79,654	79,654
Vested awards of restricted stock (in shares)									237	104	105
Average Shares – Basic (in shares)									79,891	79,758	79,759
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)									250	374	380
Average Shares – Diluted (in shares)									80,141	80,132	80,139
Net Earnings Attributable to PNMR Per Share of Common Stock:
Basic (in dollars per share)	$ (0.68)	$ 0.92	$ 0.47	$ 0.29	$ 0.32	$ 0.68	$ 0.34	$ 0.13	$ 1.00	$ 1.47	$ 0.20
Diluted (in dollars per share)	$ (0.68)	$ 0.92	$ 0.47	$ 0.29	$ 0.31	$ 0.68	$ 0.34	$ 0.13	1.00	1.46	0.20
Dividends Declared per Common Share (in dollars per share)									$ 0.9925	$ 0.9025	$ 0.82

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

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