Incentive Award Plan |
3 Months Ended |
|---|---|
Mar. 31, 2018 | |
| Retirement Benefits [Abstract] | |
| Incentive Award Plan | Incentive Award Plan Restricted Shares of Common Stock During the three months ended March 31, 2018, the Company granted 0.9 million restricted shares under the Amended Incentive Award Plan to certain executive officers and employees. The Company recorded $7.0 million in deferred compensation associated with these grants, which will be recognized in expense over the service period of the awards. As of March 31, 2018, there were approximately 2.1 million unvested restricted shares outstanding. Performance Share Awards During the three months ended March 31, 2018, the Board of Directors or committee thereof approved target grants of 0.5 million performance shares to executive officers of the Company. The performance period of these grants runs through December 31, 2020. Potential shares of the Corporation'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. Approximately $1.1 million and $0.8 million in dividend rights have been accrued for non-vested performance share awards outstanding as of March 31, 2018 and December 31, 2017, respectively. For outstanding non-vested awards at March 31, 2018, 1.8 million shares would have been released based on the Corporation's TSR relative to the specified peer groups through that date. Stock-based Compensation Expense For the three months ended March 31, 2018 and 2017, the Company recognized $4.4 million and $2.2 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 March 31, 2018, the remaining unamortized stock-based compensation expense totaled $25.4 million, with $14.4 million related to restricted stock awards and $11.0 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. |