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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Attributable to PNMR	$ 24,809	$ 54,418	$ 27,076	$ 10,546	$ (91,418)	$ 61,045	$ 31,673	$ 14,340	$ 116,849	$ 15,640	$ 116,254
Average Number of Common Shares:
Outstanding during year (in shares)									79,654	79,654	79,654
Vested awards of restricted stock (in shares)									104	105	134
Average Shares – Basic (in shares)									79,758	79,759	79,788
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)									374	380	491
Average Shares – Diluted (in shares)									80,132	80,139	80,279
Net Earnings Per Share of Common Stock:
Basic (dollars per share)	$ 0.32	$ 0.68	$ 0.34	$ 0.13	$ (1.15)	$ 0.77	$ 0.40	$ 0.18	$ 1.47	$ 0.20	$ 1.46
Diluted (dollars per share)	$ 0.31	$ 0.68	$ 0.34	$ 0.13	$ (1.15)	$ 0.76	$ 0.40	$ 0.18	1.46	0.20	1.45
Dividends Declared per Common Share (in dollars per share)									$ 0.9025	$ 0.82	$ 0.755

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

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