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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
| September 30, |  | September 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
| (In thousands, except per share amounts)
Net Earnings Attributable to PNMR | $ | 43,662 |  |  | $ | 48,552 |  |  | $ | 64,366 |  |  | $ | 62,981 |
Average Number of Common Shares: |  |  |  |  |  |  |
Outstanding during period | 86,673 |  |  | 86,673 |  |  | 86,673 |  |  | 86,673 |
Equivalents from convertible preferred stock (Note 7) | 4,363 |  |  | 4,778 |  |  | 4,638 |  |  | 4,778 |
Vested awards of restricted stock | 164 |  |  | 111 |  |  | 154 |  |  | 105 |
Average Shares - Basic | 91,200 |  |  | 91,562 |  |  | 91,465 |  |  | 91,556 |
Dilutive Effect of Common Stock Equivalents (1): |  |  |  |  |  |  |
Stock options and restricted stock | 542 |  |  | 219 |  |  | 516 |  |  | 258 |
Average Shares - Diluted | 91,742 |  |  | 91,781 |  |  | 91,981 |  |  | 91,814 |
Net Earnings Per Share of Common Stock: |  |  |  |  |  |  |
Basic | $ | 0.48 |  |  | $ | 0.53 |  |  | $ | 0.70 |  |  | $ | 0.69 |
Diluted | $ | 0.48 |  |  | $ | 0.53 |  |  | $ | 0.70 |  |  | $ | 0.69 |
(1) | Excludes the effect of out-of-the-money options for 1,923,608 shares of common stock at September 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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