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Earnings Per Share (Details) (USD $) In Thousands, except Share data | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Schedule of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |
Net Earnings Attributable to PNMR | $ 43,662 |  | $ 48,552 |  | $ 64,366 |  | $ 62,981 |
Average Number of Common Shares: |  |  |  |  |  |  |  |
Outstanding during period | 86,673,000 |  | 86,673,000 |  | 86,673,000 |  | 86,673,000 |
Equivalents from convertible preferred stock | 4,363,000 |  | 4,778,000 |  | 4,638,000 |  | 4,778,000 |
Vested awards of restricted stock | 164,000 |  | 111,000 |  | 154,000 |  | 105,000 |
Average Shares - Basic | 91,200,000 |  | 91,562,000 |  | 91,465,000 |  | 91,556,000 |
Dilutive Effect of Common Stock Equivalents: |  |  |  |  |  |  |  |
Stock options and restricted stock | 542,000 | [1] | 219,000 | [1] | 516,000 | [1] | 258,000 | [1]
Average Shares - Diluted | 91,742,000 |  | 91,781,000 |  | 91,981,000 |  | 91,814,000 |
Net Earnings Per Share of Common Stock |  |  |  |  |  |  |  |
Basic (dollars per share) | $ 0.48 |  | $ 0.53 |  | $ 0.70 |  | $ 0.69 |
Diluted (dollars per share) | $ 0.48 |  | $ 0.53 |  | $ 0.70 |  | $ 0.69 |
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price |  |  |  |  | 1,923,608 |  |  |
[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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