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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ 37,555	$ 27,076	$ 60,417	$ 37,622
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)	251	97	181	101
Average Shares – Basic (in shares)	79,905	79,751	79,835	79,755
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)	226	357	286	381
Average Shares – Diluted (in shares)	80,131	80,108	80,121	80,136
Net Earnings Per Share of Common Stock:
Basic (in dollars per share)	$ 0.47	$ 0.34	$ 0.76	$ 0.47
Diluted (in dollars per share)	$ 0.47	$ 0.34	$ 0.75	$ 0.47

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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