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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 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 nine months ended September 30, 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 | (757,497 | ) |  | $ | 13.60 |  |  |  |  |  |
Forfeited | (5,101 | ) |  | $ | 12.22 |  |  |  |  |  |
Expired | (265,443 | ) |  | $ | 25.71 |  |  |  |  |  |
Outstanding at end of period | 2,174,188 |  |  | $ | 20.01 |  |  | $ | 9,429,630 |  | (1) |  | 4.52 years
Exercisable at end of period | 2,033,857 |  |  | $ | 21.39 |  |  | $ | 8,195,812 |  |  |  | 4.32 years
(1) At September 30, 2012, the exercise price of 1,108,946 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:
|  | Nine Months Ended September 30,
|  | 2012 |  | 2011
Weighted-average grant date fair value of options granted |  | $ | — |  |  | $ | — |
Total fair value of options that vested (in thousands) |  | $ | 1,058 |  |  | $ | 1,189 |
Total intrinsic value of options exercised (in thousands) |  | $ | 4,515 |  |  | $ | 1,077 |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes restricted stock activity, including performance-based and market-based shares, for the nine months ended September 30, 2012:
|  | Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at beginning of period |  | 418,730 |  |  | $ | 12.36 |
Granted |  | 320,597 |  |  | $ | 15.63 |
Vested |  | (375,402 | ) |  | $ | 12.67 |
Forfeited |  | (7,503 | ) |  | $ | 12.48 |
Nonvested at end of period |  | 356,422 |  |  | $ | 14.71 |
Schedule of Nonvested Share Activity Additional Information [Table Text Block] | The following table provides additional information concerning restricted stock, including performance-based and market-based shares:
|  | Nine Months Ended
|  | September 30,
|  | 2012 |  | 2011
Weighted-average grant date fair value of shares granted |  | $ | 15.63 |  |  | $ | 13.10 |
Total fair value of shares that vested (in thousands) |  | $ | 4,755 |  |  | $ | 1,084 |
Expected quarterly dividends per share |  | $ | 0.145 |  |  | $ | 0.125 |
Risk-free interest rate |  | 0.76 | % |  | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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