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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ 27,678		$ 21,512		$ 38,304		$ 38,592
Average Number of Common Shares:
Outstanding during period	79,654,000		79,654,000		79,654,000		79,654,000
Vested awards of restricted stock	194,000		154,000		202,000		177,000
Average Shares - Basic	79,848,000		79,808,000		79,856,000		79,831,000
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock	607,000	[1]	558,000	[1]	661,000	[1]	590,000	[1]
Average Shares - Diluted	80,455,000		80,366,000		80,517,000		80,421,000
Net Earnings Per Share of Common Stock
Basic (dollars per share)	$ 0.35		$ 0.27		$ 0.48		$ 0.48
Diluted (dollars per share)	$ 0.34		$ 0.27		$ 0.48		$ 0.48
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)					825,877
[1] Excludes the effect of out-of-the-money options for 825,877 shares of common stock at June 30, 2013.

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