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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2011
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Information regarding the computation of earnings per share is as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
| (In thousands, except per share amounts)
Net Earnings Attributable to PNMR | $ | 4,067 |  |  | $ | 22,878 |  |  | $ | 20,704 |  |  | $ | 14,429 |
Average Number of Common Shares: |  |  |  |  |  |  |
Outstanding during period | 86,673 |  |  | 86,673 |  |  | 86,673 |  |  | 86,673 |
Equivalents from convertible preferred stock (Note 7) | 4,778 |  |  | 4,778 |  |  | 4,778 |  |  | 4,778 |
Vested awards of restricted stock | 139 |  |  | 109 |  |  | 149 |  |  | 102 |
Average Shares - Basic | 91,590 |  |  | 91,560 |  |  | 91,600 |  |  | 91,553 |
Dilutive Effect of Common Stock Equivalents (1): |  |  |  |  |  |  |
Stock options and restricted stock | 546 |  |  | 273 |  |  | 502 |  |  | 141 |
Average Shares - Diluted | 92,136 |  |  | 91,833 |  |  | 92,102 |  |  | 91,694 |
Net Earnings Per Share of Common Stock: |  |  |  |  |  |  |
Basic | $ | 0.04 |  |  | $ | 0.25 |  |  | $ | 0.23 |  |  | $ | 0.16 |
Diluted | $ | 0.04 |  |  | $ | 0.25 |  |  | $ | 0.22 |  |  | $ | 0.16 |
(1) | Excludes the effect of out-of-the-money options for 1,978,010 shares of common stock at June 30, 2011.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + Details
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