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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2011
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 option plans for the nine months ended September 30, 2011:
| Shares |  | Weighted- Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted- Average Remaining Contract Life
Outstanding at beginning of period | 3,948,262 |  |  | $ | 18.33 |  |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |  |
Exercised | (254,394 | ) |  | $ | 10.99 |  |  |  |  |  |
Forfeited | (10,333 | ) |  | $ | 11.26 |  |  |  |  |  |
Expired | (102,338 | ) |  | $ | 24.96 |  |  |  |  |  |
Outstanding at end of period | 3,581,197 |  |  | $ | 18.68 |  |  | $ | 8,950,188 |  | (1) |  | 5.12 years
Exercisable at end of period | 3,045,556 |  |  | $ | 21.97 |  |  | $ | 6,011,541 |  |  |  | 4.60 years
Options available for future grant(2) | 4,820,656 |  |  |  |  |  |  |  |
(1) At September 30, 2011, the exercise price of 1,923,608 outstanding stock options is greater than the closing price of PNMR common stock on that date; therefore, those options have no intrinsic value. (2) Includes shares available for grants of restricted stock.
Schedule of Additional Stock Option Activity [Table Text Block] | The following table provides additional information concerning stock option activity:
|  | Nine Months Ended September 30,
Options for PNMR Common Stock |  | 2011 |  | 2010
Weighted-average grant date fair value of options granted |  | $ | — |  |  | $ | 3.05 |
Total fair value of options that vested (in thousands) |  | $ | 1,189 |  |  | $ | 1,027 |
Total intrinsic value of options exercised (in thousands) |  | $ | 1,077 |  |  | $ | 474 |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes nonvested restricted stock activity for the nine months ended September 30, 2011:
Nonvested Restricted Stock |  | Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at beginning of period |  | 237,021 |  |  | $ | 9.24 |
Granted |  | 308,985 |  |  | $ | 13.10 |
Vested |  | (113,576 | ) |  | $ | 9.54 |
Forfeited |  | (1,000 | ) |  | $ | 13.67 |
Nonvested at end of period |  | 431,430 |  |  | $ | 11.92 |
Schedule of Nonvested Share Activity Additional Information [Table Text Block] | The following table provides additional information concerning restricted stock:
|  | Nine Months Ended
|  | September 30,
Nonvested Restricted Stock |  | 2011 |  | 2010
Weighted-average grant date fair value of shares granted |  | $ | 13.10 |  |  | $ | 9.37 |
Total fair value of shares that vested (in thousands) |  | $ | 1,084 |  |  | $ | 1,365 |
Expected quarterly dividends per share |  | $ | 0.125 |  |  | $ | 0.125 |
Risk-free interest rate |  | 1.20 | % |  | 1.36 | %

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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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