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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Earnings Per Share [Abstract]
Net Earnings Attributable to PNMR	$ 10,626		$ 17,080
Average Number of Common Shares:
Outstanding during period	79,654,000		79,654,000
Vested awards of restricted stock	211,000		200,000
Average Shares - Basic	79,865,000		79,854,000
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock	715,000	[1]	621,000	[1]
Average Shares - Diluted	80,580,000		80,475,000
Net Earnings Per Share of Common Stock
Basic (dollars per share)	$ 0.13		$ 0.21
Diluted (dollars per share)	$ 0.13		$ 0.21
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)	827,977
[1] Excludes the effect of out-of-the-money options for 827,977 shares of common stock at March 31, 2013.

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