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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ 54,418	$ 61,045	$ 92,040	$ 107,058
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)	96	100	99	103
Average Shares – Basic (in shares)	79,750	79,754	79,753	79,757
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)	367	362	377	377
Average Shares – Diluted (in shares)	80,117	80,116	80,130	80,134
Net Earnings Per Share of Common Stock:
Basic (in dollars per share)	$ 0.68	$ 0.77	$ 1.15	$ 1.34
Diluted (in dollars per share)	$ 0.68	$ 0.76	$ 1.15	$ 1.34

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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