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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2012
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,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (In thousands, except per share amounts)
Net Earnings Attributable to PNMR | $ | 21,512 |  |  | $ | 4,067 |  |  | $ | 38,592 |  |  | $ | 20,704 |
Average Number of Common Shares: |  |  |  |  |  |  |
Outstanding during period | 79,654 |  |  | 86,673 |  |  | 79,654 |  |  | 86,673 |
Equivalents from convertible preferred stock (Note 7) | — |  |  | 4,778 |  |  | — |  |  | 4,778 |
Vested awards of restricted stock | 154 |  |  | 139 |  |  | 177 |  |  | 149 |
Average Shares - Basic | 79,808 |  |  | 91,590 |  |  | 79,831 |  |  | 91,600 |
Dilutive Effect of Common Stock Equivalents (1): |  |  |  |  |  |  |
Stock options and restricted stock | 558 |  |  | 546 |  |  | 590 |  |  | 502 |
Average Shares - Diluted | 80,366 |  |  | 92,136 |  |  | 80,421 |  |  | 92,102 |
Net Earnings Per Share of Common Stock: |  |  |  |  |  |  |
Basic | $ | 0.27 |  |  | $ | 0.04 |  |  | $ | 0.48 |  |  | $ | 0.23 |
Diluted | $ | 0.27 |  |  | $ | 0.04 |  |  | $ | 0.48 |  |  | $ | 0.22 |
(1) | Excludes the effect of out-of-the-money options for 1,356,468 shares of common stock at June 30, 2012.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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