Incentive Award Plan
6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Incentive Award Plan
Incentive Award Plan
Restricted Shares of Common Stock
During the six months ended June 30, 2018, the Company granted 1.0 million restricted shares under the Amended Incentive Award Plan to certain executive officers and employees. The Company recorded $7.9 million in deferred compensation associated with these grants, which will be recognized in expense over the service period of the awards. As of June 30, 2018, there were approximately 1.9 million unvested restricted shares outstanding.
In connection with the Spin-Off on May 31, 2018, holders of unvested restricted shares of Spirit common stock received unrestricted shares of SMTA common stock on a pro rata basis of one share of SMTA common stock for every ten shares of Spirit common stock. The distribution of unrestricted SMTA shares is considered an award modification that did not result in incremental fair value and, therefore, incremental compensation expense was not recognized. However, since the vesting period of the unrestricted SMTA shares was accelerated, $1.4 million of unrecognized stock-based compensation expense was accelerated and is reflected within general and administrative expenses on the accompanying consolidated statements of operations and comprehensive income.
Performance Share Awards
During the six months ended June 30, 2018, the Board of Directors, or committee thereof, approved target grants of 504,497 performance shares to executive officers of the Company. The performance period of these grants runs primarily through December 31, 2020. Potential shares of the Company's common stock that each participant is eligible to receive is based on the initial target number of shares granted, multiplied by a percentage range between 0% and 250%. Grant date fair value was calculated using the Monte Carlo simulation model, which incorporated stock price correlation, projected dividend yields and other variables over the time horizons matching the performance periods. Stock-based compensation expense associated with unvested performance share awards is recognized on a straight-line basis over the minimum required service period, which is generally three years.
In connection with the Spin-Off and in accordance with the rights granted per the Amended Incentive Award Plan, the Board of Directors made an equitable adjustment for all performance share awards outstanding, resulting in 134,000 incremental target shares. Because the fair value of the outstanding performance awards the day prior to and the day after the Spin-off did not materially change, there was no change to unrecognized compensation expense and incremental compensation expense did not result.
Approximately $1.2 million and $0.8 million in dividend rights have been accrued for non-vested performance share awards outstanding as of June 30, 2018 and December 31, 2017, respectively. For outstanding non-vested awards at June 30, 2018, 2.5 million shares would have been released based on the Company's TSR relative to the specified peer groups through that date.
Stock-based Compensation Expense
For the three months ended June 30, 2018 and 2017, the Company recognized $4.7 million and $9.2 million, respectively, in stock-based compensation expense, and for the six months ended June 30, 2018 and 2017, the Company recognized $9.1 million and $11.4 million, respectively, in stock-based compensation expense which is included in general and administrative expenses in the accompanying consolidated statements of operations and comprehensive income.
As of June 30, 2018, the remaining unamortized stock-based compensation expense totaled $21.6 million, with $11.8 million related to restricted stock awards and $9.8 million related to performance share awards. Amortization is recognized as the greater of the amount amortized on a straight-line basis over the service period of each applicable award or the amount vested over the vesting periods.