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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ 27,076	$ 31,673	$ 37,622	$ 46,013
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)	97	99	101	105
Average Shares – Basic (in shares)	79,751	79,753	79,755	79,759
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock (in shares)	357	380	381	384
Average Shares – Diluted (in shares)	80,108	80,133	80,136	80,143
Net Earnings Per Share of Common Stock:
Basic (in dollars per share)	$ 0.34	$ 0.40	$ 0.47	$ 0.58
Diluted (in dollars per share)	$ 0.34	$ 0.40	$ 0.47	$ 0.57

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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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