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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Option Activity Including Exerciseable and Future Grant Information [Table Text Block] | The following table summarizes activity in stock options for the three months ended March 31, 2012:
| Shares |  | Weighted- Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted- Average Remaining Contract Life
Outstanding at beginning of period | 3,202,229 |  |  | $ | 18.95 |  |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |  |
Exercised | (368,895 | ) |  | $ | 13.57 |  |  |  |  |  |
Forfeited | (2,667 | ) |  | $ | 12.22 |  |  |  |  |  |
Expired | (234,091 | ) |  | $ | 25.65 |  |  |  |  |  |
Outstanding at end of period | 2,596,576 |  |  | $ | 19.07 |  |  | $ | 8,858,517 |  | (1) |  | 4.78 years
Exercisable at end of period | 2,439,635 |  |  | $ | 20.29 |  |  | $ | 7,933,890 |  |  |  | 4.59 years
(1) At March 31, 2012, the exercise price of 1,360,568 outstanding stock options is greater than the closing price of PNMR common stock on that date; therefore, those options have no intrinsic value.
Schedule of Additional Stock Option Activity [Table Text Block] | The following table provides additional information concerning stock options:
|  | Three Months Ended March 31,
|  | 2012 |  | 2011
Weighted-average grant date fair value of options granted |  | $ | — |  |  | $ | — |
Total fair value of options that vested (in thousands) |  | $ | 1,058 |  |  | $ | 1,179 |
Total intrinsic value of options exercised (in thousands) |  | $ | 1,722 |  |  | $ | 396 |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes restricted stock activity, including performance shares, for the three months ended March 31, 2012:
|  | Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at beginning of period |  | 418,730 |  |  | $ | 12.36 |
Granted |  | 293,039 |  |  | $ | 14.33 |
Vested |  | (264,422 | ) |  | $ | 12.22 |
Forfeited |  | (2,089 | ) |  | $ | 11.44 |
Nonvested at end of period |  | 445,258 |  |  | $ | 13.57 |
Schedule of Nonvested Share Activity Additional Information [Table Text Block] | The following table provides additional information concerning restricted stock, including performance shares:
|  | Three Months Ended
|  | March 31,
|  | 2012 |  | 2011
Weighted-average grant date fair value of shares granted |  | $ | 14.33 |  |  | $ | 12.90 |
Total fair value of shares that vested (in thousands) |  | $ | 3,232 |  |  | $ | 758 |
Expected quarterly dividends per share |  | $ | 0.145 |  |  | $ | 0.125 |
Risk-free interest rate |  | 0.43 | % |  | 1.20 | %

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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