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Equity Awards | 3 Months Ended
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Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Equity Awards | Equity Awards Restricted Stock Units The Company awarded the following restricted stock units ("RSUs") during the three months ended March 31, 2023: •granted 250,625 RSUs to certain employees, which are subject only to a service condition and vest ratably over three years so long as the employee remains with the Company; •granted 27,560 RSUs to its non-employee independent directors, which fully vest one year from date of grant so long as the director and/or Company does not terminate the director's service prior to the vesting date; and •issued 31 RSUs to certain employees related to dividend equivalent rights on existing equity awards. During 2023, the Company also awarded 95,017 performance-based RSUs to certain Company key employees which vest three years from the grant date as long as the employee remains with the Company. These awards are initially earned 50% based upon the Company's achievement of an earnings per share compound annual growth rate ("EPS CAGR") metric and 50% based upon the Company's cash return on net assets ("Cash RONA") metric over a period beginning January 1, 2023 and ending December 31, 2025. The total EPS CAGR and Cash RONA performance-based RSUs initially earned shall be subject to modification based on the Company's total shareholder return ("TSR") relative to the TSR of the common stock of a pre-defined industry peer-group, measured over the performance period. TSR is calculated as the Company's average closing stock price for the 20 trading days at the end of the performance period plus Company dividends, divided by the Company's average closing stock price for the 20 trading days prior to the start of the performance period. The Company estimates the grant-date fair value subject to a market condition using a Monte Carlo simulation model, using the following weighted average assumptions: risk-free rate of 4.36% and annualized volatility of 33.9%. Depending on the performance achieved for these two metrics, the amount of shares earned, if any, can vary for each metric from 0% of the target award to a maximum of 250% of the target. During 2020, the Company awarded performance-based RSUs to certain Company key employees which were earned 50% based upon the Company's achievement of earnings per share compound annual growth rate metric over a period beginning January 1, 2020 and ending December 31, 2022. The remaining 50% of the awards were earned based on the Company's total shareholder return relative to the TSR of the common stock of a pre-defined industry peer-group, measured over the performance period. The Company attained 62.7% of the target on a weighted average basis, resulting in a decrease of 32,430 shares during the three months ended March 31, 2023. During 2020, the Company awarded performance-based RSUs to certain Company key employees which were earned based upon the Company's stock price performance over the period beginning January 1, 2020 and ending December 31, 2022. The stock price achievement was calculated based on the Company's average closing stock price for each quarter end for the 20 trading days up to and including March 31, June 30, September 30 and December 31, 2022, respectively. The Company did not meet the minimum performance threshold resulting in a decrease of 86,275 shares during the three months ended March 31, 2023. Information related to RSUs at March 31, 2023 is as follows:
|  | Number of Unvested RSUs |  | Weighted Average Grant Date Fair Value |  | Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2023 |  | 719,449 |  |  | $ | 28.40 |  |  |  |  |
Granted |  | 373,233 |  |  | 29.62 |  |  |  |  |
Vested |  | (237,865) |  |  | 27.85 |  |  |  |  |
Cancelled |  | (137,661) |  |  | 18.33 |  |  |  |  |
Outstanding at March 31, 2023 |  | 717,156 |  |  | $ | 31.16 |  |  | 1.7 |  | $ | 19,979,966 |
As of March 31, 2023, there was $13.6 million of unrecognized compensation cost related to unvested RSUs that is expected to be recorded over a weighted average period of 1.8 years. The Company recognized stock-based compensation expense related to RSUs of $2.9 million and $2.8 million during the three months ended March 31, 2023 and 2022, respectively. The stock-based compensation expense is included in selling, general and administrative expenses in the accompanying consolidated statement of income.

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