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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
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”). Although certain PNM and TNMP employees participate in the PNMR plans, PNM and TNMP do not have separate employee stock-based compensation plans. The Company has not awarded stock options since 2010. Certain restricted stock awards are subject to achieving performance or market targets. 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 2017 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, awards to employees vest ratably over three years from the grant date of the award. However, 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 certain stock awards. Awards of restricted stock to non-employee members of the Board are expensed over a one year vesting period. The stock-based compensation expense related to restricted stock awards without performance or market conditions to participants that are retirement eligible on the grant date is recognized immediately at the grant date and is not amortized. Compensation expense for other such awards is amortized to compensation expense over the shorter of the requisite vesting period or the period until the participant becomes retirement eligible. Compensation expense for performance-based shares is recognized over the performance period as required service is provided 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 June 30, 2018 and December 31, 2017, PNMR had unrecognized expense related to stock awards of $5.4 million and $3.8 million, which are expected to be recognized over an average of 1.79 and 1.53 years. PNMR receives a tax deduction for certain stock option exercises during the period the options are exercised, generally for the excess of the price at which the options are sold over the exercise prices of the options, and a tax deduction for the value of restricted stock at the vesting date. GAAP requires that all excess tax benefits and deficiencies be recorded to tax expense and, when used to reduce income taxes payable, classified as cash flows from operating activities. 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:
|  | Six Months Ended June 30,
Restricted Shares and Performance Based Shares |  | 2018 |  | 2017
Expected quarterly dividends per share |  | $ | 0.2650 |  |  | $ | 0.2425 |
Risk-free interest rate |  | 2.38 | % |  | 1.50 | %
Market-Based Shares |  |  |  |
Dividend yield |  | 2.96 | % |  | 2.67 | %
Expected volatility |  | 19.12 | % |  | 20.80 | %
Risk-free interest rate |  | 2.36 | % |  | 1.54 | %
The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options, for the six months ended June 30, 2018:
| Restricted Stock |  | Stock Options
| Shares |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Exercise Price
Outstanding at December 31, 2017 | 189,045 |  |  | $ | 31.11 |  |  | 193,441 |  |  | $ | 9.98 |
Granted | 221,062 |  |  | $ | 29.65 |  |  | — |  |  | $ | — |
Exercised | (231,735 | ) |  | $ | 28.37 |  |  | (107,941 | ) |  | $ | 8.56 |
Forfeited | (3,562 | ) |  | $ | 30.58 |  |  | — |  |  | $ | — |
Expired | — |  |  | $ | — |  |  | — |  |  | $ | — |
Outstanding at June 30, 2018 | 174,810 |  |  | $ | 32.90 |  |  | 85,500 |  |  | $ | 11.77 |
PNMR’s stock-based compensation program provides for performance and market targets through 2020. Included as granted and as exercised in the above table are 97,697 previously awarded shares that were earned for the 2015 through 2017 performance measurement period and ratified by the Board in February 2018 (based upon achieving market targets at “target” levels, weighted at 60%, and performance targets at below “target” levels, weighted at 40%). Excluded from the above table are maximums of 138,081, 135,818, and 152,750 shares for the three-year performance periods ending in 2018, 2019, and 2020 that would be awarded if all performance and market criteria are achieved at maximum levels and all executives remain eligible. Effective as of January 1, 2015, the Company entered into a retention award agreement with its Executive Vice President and Chief Financial Officer under which he would receive awards of restricted stock if PNMR met specific performance targets at the end of 2016 and 2017 and he remained an employee of the Company. If PNMR achieved the specified performance target for the period from January 1, 2015 through December 31, 2016, he was to receive $100,000 of PNMR common stock based on the market value per share on the grant date in early 2017. The specified market target was achieved at the end of 2016 and the Board ratified him receiving $100,000 of PNMR common stock in February 2017 based on a market per share value of $36.30 on the grant date of March 3, 2017, or 2,754 shares. Similarly, if PNMR achieved the specified performance target for the period from January 1, 2015 through December 31, 2017, he was to receive $275,000 of PNMR common stock based on the market value per share on the grant date in early 2018. The specified performance target was achieved at the end of 2017 and the Board ratified him receiving $275,000 of PNMR common stock in February 2018 based on the market value per share of $35.85 on the grant date of March 2, 2018, or 7,670 shares, which are included in the above table. The retention award was made under the PEP and was approved by the Board on December 9, 2014. In March 2015, the Company entered into a retention award agreement with its Chairman, President, and Chief Executive Officer under which she would receive 53,859 shares of PNMR’s common stock if PNMR meets certain performance targets at the end of 2019 and she remains an employee of the Company. Under the agreement, she was to receive 17,953 of the total shares if PNMR achieved specific performance targets at the end of 2017. The specified performance target was achieved at the end of 2017 and the Board ratified her receiving the 17,953 shares in February 2018, which are included in the above table. The retention award was made under the PEP and was approved by the Board on February 26, 2015. The above table does not include the restricted stock shares that remain unvested under this retention award agreement. At June 30, 2018, the aggregate intrinsic value of stock options outstanding, all of which are exercisable, was $2.3 million with a weighted-average remaining contract life of 1.5 years. At June 30, 2018, no outstanding stock options had an exercise price greater than the closing price of PNMR common stock on that date. The following table provides additional information concerning restricted stock activity, including performance-based and market-based shares, and stock options:
|  | Six Months Ended June 30,
Restricted Stock |  | 2018 |  | 2017
Weighted-average grant date fair value |  | $ | 29.65 |  |  | $ | 23.06 |
Total fair value of restricted shares that vested (in thousands) |  | $ | 8,328 |  |  | $ | 5,489 |
Stock Options |  |  |  |
Weighted-average grant date fair value of options granted |  | $ | — |  |  | $ | — |
Total fair value of options that vested (in thousands) |  | $ | — |  |  | $ | — |
Total intrinsic value of options exercised (in thousands) |  | $ | 2,968 |  |  | $ | 1,699 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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