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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company maintains two equity compensation plans under which stock-based compensation has been granted: the 2017 Long-Term Incentive Plan (which was amended and restated as of April 23, 2020) (the “LTIP”) and the 2007 Long-Term Incentive Plan (as amended) (the “2007 Plan”). Upon the adoption of the original LTIP in 2017, awards were no longer granted under the 2007 Plan. The LTIP provides for grants of (a) incentive stock options qualified as such under U.S. federal income tax laws, (b) stock options that do not qualify as incentive stock options, (c) stock appreciation rights, (d) restricted stock awards, (e) restricted stock units, (f) performance share awards, (g) phantom stock units, (h) stock bonuses, (i) dividend equivalents, and (j) any combination of such grants. The Company has outstanding grants of non-qualified stock options, time-vested stock awards in the form of restricted stock units and internal metric-based and market-based performance stock units. During the six months ended June 30, 2021, the Company granted time-vested stock awards covering 57,196 shares of common stock under the LTIP, which vest ratably over three years for employee awards and after one year for non-employee director awards, at a weighted average grant date fair value of $66.80. During the six months ended June 30, 2021, time-vested stock awards covering 87,584 shares of common stock vested at a weighted average grant date fair value of $29.20. During the six months ended June 30, 2021, the Company granted 42,091 performance share awards under the LTIP at target, which will cliff vest, if earned, on December 31, 2023, at a weighted average grant date fair value of $80.11. The number of shares ultimately earned under a performance award may vary from zero to 200% of the target shares granted, based upon the Company’s performance compared to certain metrics. The metrics used were determined at the time of the grant by the Compensation Committee of the Board of Directors and were either based on internal measures, such as the Company’s financial performance compared to targets, or on a market-based metric, such as the Company’s stock performance compared to a peer group. Performance awards granted cliff vest following the performance period if the stated performance targets and minimum service requirements are attained and are paid in shares of the Company’s common stock. During the six months ended June 30, 2021, plan participants exercised options to purchase 18,640 shares of the Company’s common stock with a weighted average exercise price of $23.02. The Company recognizes stock-based compensation expense related to restricted stock units based on the grant date fair value, which was the closing price of the Company’s stock on the date of grant. The fair value is expensed over the service period, which is generally three years. For performance awards, the Company recognizes stock-based compensation expense based on the grant date fair value of the award. The fair value of internal metric-based performance awards is determined by the closing stock price of the Company’s common stock on the date of the grant. The fair value of market-based performance awards is computed using a Monte Carlo simulation. Performance awards are expensed over the service period of approximately 2.8 years, and the Company adjusts the stock-based compensation expense related to internal metric-based performance awards according to its determination of the shares expected to vest at each reporting date.

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