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Earnings and Dividends Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Attributable to PNMR | $ 7,648 | $ 54,555 | $ 27,678 | $ 10,626 | $ 9,091 | $ 57,864 | $ 21,512 | $ 17,080 | $ 100,507 |  | $ 105,547 |  | $ 176,359 |
Average Number of Common Shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding during year |  |  |  |  |  |  |  |  | 79,654,000 |  | 79,654,000 |  | 85,558,000 |
Equivalents from convertible preferred stock (Note 5) |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 3,469,000 |
Vested awards of restricted stock |  |  |  |  |  |  |  |  | 191,000 |  | 145,000 |  | 174,000 |
Average Shares - Basic |  |  |  |  |  |  |  |  | 79,845,000 |  | 79,799,000 |  | 89,201,000 |
Dilutive Effect of Common Stock Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock |  |  |  |  |  |  |  |  | 586,000 | [1] | 618,000 | [1] | 556,000 | [1]
Average Shares – Diluted |  |  |  |  |  |  |  |  | 80,431,000 | [1] | 80,417,000 | [1] | 89,757,000 | [1]
Net Earnings Per Share of Common Stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (dollars per share) | $ 0.10 | $ 0.68 | $ 0.35 | $ 0.13 | $ 0.11 | $ 0.73 | $ 0.27 | $ 0.21 | $ 1.26 |  | $ 1.32 |  | $ 1.98 |
Diluted (dollars per share) | $ 0.10 | $ 0.68 | $ 0.34 | $ 0.13 | $ 0.11 | $ 0.72 | $ 0.27 | $ 0.21 | $ 1.25 |  | $ 1.31 |  | $ 1.96 |
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares) |  |  |  |  |  |  |  |  | 509,916 |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  | $ 0.68 |  | $ 0.58 |  | $ 0.50 |
[1] | Excludes out-of-the-money options for 509,916 shares of common stock at December 31, 2013. See Note 13.

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