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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
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,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (In thousands, except per share amounts)
Net Earnings Attributable to PNMR | $ | 27,678 |  |  | $ | 21,512 |  |  | $ | 38,304 |  |  | $ | 38,592 |
Average Number of Common Shares: |  |  |  |  |  |  |
Outstanding during period | 79,654 |  |  | 79,654 |  |  | 79,654 |  |  | 79,654 |
Vested awards of restricted stock | 194 |  |  | 154 |  |  | 202 |  |  | 177 |
Average Shares - Basic | 79,848 |  |  | 79,808 |  |  | 79,856 |  |  | 79,831 |
Dilutive Effect of Common Stock Equivalents (1): |  |  |  |  |  |  |
Stock options and restricted stock | 607 |  |  | 558 |  |  | 661 |  |  | 590 |
Average Shares - Diluted | 80,455 |  |  | 80,366 |  |  | 80,517 |  |  | 80,421 |
Net Earnings Per Share of Common Stock: |  |  |  |  |  |  |
Basic | $ | 0.35 |  |  | $ | 0.27 |  |  | $ | 0.48 |  |  | $ | 0.48 |
Diluted | $ | 0.34 |  |  | $ | 0.27 |  |  | $ | 0.48 |  |  | $ | 0.48 |
(1) | Excludes the effect of out-of-the-money options for 825,877 shares of common stock at June 30, 2013.

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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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