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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ 12,468		$ 10,626
Average Number of Common Shares:
Outstanding during period	79,654,000		79,654,000
Vested awards of restricted stock	182,000		211,000
Average Shares - Basic	79,836,000		79,865,000
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock	551,000	[1]	715,000	[1]
Average Shares - Diluted	80,387,000		80,580,000
Net Earnings Per Share of Common Stock
Basic (dollars per share)	$ 0.16		$ 0.13
Diluted (dollars per share)	$ 0.16		$ 0.13
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)	486,016
[1] Excludes the effect of out-of-the-money options for 486,016 shares of common stock at March 31, 2014.

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