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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation PNMR has various stock-based compensation programs, including stock options, restricted stock, and performance shares granted under the Performance Equity Plan (“PEP”). In 2011, the Company changed its approach to awarding stock-based compensation. As a result, no stock options have been granted since 2010 and awards of restricted stock have increased. Certain restricted stock awards are subject to achieving performance or market targets and some of these awards also have time vesting requirements. Other awards of restricted stock are only subject to time vesting requirements. Additional information concerning stock-based compensation under the PEP is contained in Note 13 of the Notes to Consolidated Financial Statements in the 2013 Annual Reports on Form 10-K. Restricted stock under the PEP refers to awards of stock subject to vesting, performance, or market conditions rather than to shares with contractual post-vesting restrictions. Generally, the awards vest ratably over three years from the grant date of the award. However, certain awards with performance or market conditions vest upon satisfaction of those conditions. In addition, plan provisions provide that upon retirement, participants become 100% vested in stock awards. The stock-based compensation expense related to stock options and restricted stock awards without performance or market conditions is amortized to compensation expense over the requisite vesting period, which is generally three years. However, compensation expense for awards to participants that are retirement eligible on the grant date is recognized immediately at the grant date and is not amortized. Compensation expense for performance-based shares is recognized ratably over the performance period and is adjusted periodically to reflect the level of achievement expected to be attained. Compensation expense related to market-based shares is recognized ratably over the measurement period, regardless of the actual level of achievement, provided the employees meet their service requirements. At March 31, 2014 and December 31, 2013, PNMR had unrecognized expense related to stock awards of $8.1 million and $4.6 million. The grant date fair value for restricted stock and stock awards with Company internal performance targets is determined based on the market price of PNMR common stock on the date of the agreements reduced by the present value of future dividends, which will not be received prior to vesting, applied to the total number of shares that are anticipated to vest, although the number of performance shares that ultimately vest cannot be determined until after the performance periods end. The grant date fair value of stock awards with market targets is determined using Monte Carlo simulation models, which provide grant date fair values that include an expectation of the number of shares to vest at the end of the measurement period. The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
|  | Three Months Ended March 31,
Restricted Shares and Performance Based Shares |  | 2014 |  | 2013
Expected quarterly dividends per share |  | $ | 0.185 |  |  | $ | 0.165 |
Risk-free interest rate |  | 0.71 | % |  | 0.38 | %
Market-Based Shares |  |  |  |
Dividend yield |  | 2.82 | % |  | 2.86 | %
Expected volatility |  | 25.11 | % |  | 25.11 | %
Risk-free interest rate |  | 0.64 | % |  | 0.36 | %
The following table summarizes activity in stock options and restricted stock awards, including performance-based and market-based shares, for the three months ended March 31, 2014:
| Stock Option Shares |  | Weighted- Average Exercise Price |  | Restricted Stock |  | Weighted- Average Grant Date Fair Value
Outstanding at beginning of period | 1,343,666 |  |  | $ | 20.63 |  |  | 315,305 |  |  | $ | 17.87 |
Granted | — |  |  | $ | — |  |  | 223,348 |  |  | $ | 20.79 |
Exercised | (182,407 | ) |  | $ | 17.86 |  |  | (262,358 | ) |  | $ | 16.53 |
Forfeited | (17,151 | ) |  | $ | 26.43 |  |  | — |  |  | $ | — |
Expired | (13,501 | ) |  | $ | 25.82 |  |  | — |  |  | $ | — |
Outstanding at end of period | 1,130,607 |  |  | $ | 20.92 |  |  | 276,295 |  |  | $ | 21.55 |
Included as restricted stock granted and exercised in the table above are 112,864 shares that were based upon achieving performance or market targets for 2013. The Board approved these shares in February 2014 (based upon achieving market targets, weighted at 60%, at maximum levels, and performance targets, weighted at 40%, at below threshold levels for the 2011 through 2013 performance period). PNMR’s stock-based compensation program provides for performance or market targets through 2016. Excluded from the above table are maximums of 198,369, 179,811, and 175,735 restricted stock shares for periods ending in 2014, 2015, and 2016 that would be awarded if all performance or market criteria are achieved and all executives remain eligible. In March 2012, the Company entered into a retention award agreement with its Chairman, President, and Chief Executive Officer under which she would receive 135,000 shares of PNMR’s common stock if the Company meets specific market targets at the end of 2016 and she remains an employee of the Company. If the Company achieves specific market targets at the end of 2014 and, with certain exceptions, she remains an employee of the Company, she would receive 35,000 of the total shares at that time. The retention award was made under the PEP and was approved by the Board on February 28, 2012. The above table does not include any restricted stock shares under the retention award agreement. At March 31, 2014, the aggregate intrinsic value of stock options outstanding, all of which are exercisable, was $8.0 million with a weighted-average remaining contract life of 3.39 years. At March 31, 2014, the exercise price of 486,016 outstanding stock options is greater than the closing price of PNMR common stock on that date; therefore, those options have no intrinsic value. The following table provides additional information concerning stock options and restricted stock activity, including performance-based and market-based shares:
|  | Three Months Ended March 31,
Stock Options |  | 2014 |  | 2013
Weighted-average grant date fair value of options granted |  | $ | — |  |  | $ | — |
Total fair value of options that vested (in thousands) |  | $ | — |  |  | $ | 620 |
Total intrinsic value of options exercised (in thousands) |  | $ | 1,469 |  |  | $ | 1,824 |
Restricted Stock |  |  |  |
Weighted-average grant date fair value |  | $ | 20.79 |  |  | $ | 19.82 |
Total fair value of restricted shares that vested (in thousands) |  | $ | 4,336 |  |  | $ | 3,871 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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