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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
| September 30, |  | September 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (In thousands, except per share amounts)
Net Earnings Attributable to PNMR | $ | 57,864 |  |  | $ | 43,662 |  |  | $ | 96,456 |  |  | $ | 64,366 |
Average Number of Common Shares: |  |  |  |  |  |  |
Outstanding during period | 79,654 |  |  | 86,673 |  |  | 79,654 |  |  | 86,673 |
Equivalents from convertible preferred stock (Note 7) | — |  |  | 4,363 |  |  | — |  |  | 4,638 |
Vested awards of restricted stock | 114 |  |  | 164 |  |  | 156 |  |  | 154 |
Average Shares - Basic | 79,768 |  |  | 91,200 |  |  | 79,810 |  |  | 91,465 |
Dilutive Effect of Common Stock Equivalents (1): |  |  |  |  |  |  |
Stock options and restricted stock | 622 |  |  | 542 |  |  | 600 |  |  | 516 |
Average Shares - Diluted | 80,390 |  |  | 91,742 |  |  | 80,410 |  |  | 91,981 |
Net Earnings Per Share of Common Stock: |  |  |  |  |  |  |
Basic | $ | 0.73 |  |  | $ | 0.48 |  |  | $ | 1.21 |  |  | $ | 0.70 |
Diluted | $ | 0.72 |  |  | $ | 0.48 |  |  | $ | 1.20 |  |  | $ | 0.70 |
(1) | Excludes the effect of out-of-the-money options for 1,108,946 shares of common stock at September 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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