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Equity Awards (Notes) | 3 Months Ended
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Mar. 31, 2024
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, 2024: •Granted 281,405 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 32,544 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; •Issued 28 RSUs to certain employees related to dividend equivalent rights on existing equity awards; and •Issued 1,171 RSUs related to director fee deferrals as certain of the Company's directors elected to defer all or a portion of their director fees and to receive the amount in Company common stock at a future date. During 2024, the Company also awarded 109,640 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, 2024 and ending December 31, 2026. 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 4.50% and annualized volatility of 31.4%. 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. Information related to RSUs at March 31, 2024 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, 2024 |  | 691,836 |  |  | $ | 30.97 |  |  |  |  |
Granted |  | 424,788 |  |  | 24.85 |  |  |  |  |
Vested |  | (183,582) |  |  | 30.65 |  |  |  |  |
Cancelled |  | (67,524) |  |  | 34.96 |  |  |  |  |
Outstanding at March 31, 2024 |  | 865,518 |  |  | $ | 27.73 |  |  | 1.7 |  | $ | 23,135,296 |
As of March 31, 2024, there was $10.2 million of unrecognized compensation cost related to unvested RSUs that is expected to be recorded over a weighted average period of 2.4 years. RSUs granted to employees who are eligible for retirement on the date of the grant are expensed immediately, and RSUs granted to employees who will become retirement-eligible prior to the end of the vesting term are expensed over the period through which the employee will become retirement-eligible since these awards vest upon retirement from the Company. Compensation expense for RSUs granted to employees who will not become retirement-eligible prior to the end of the vesting term is recognized on a straight-line basis over the vesting period. The Company recognized stock-based compensation expense related to RSUs of $4.6 million and $2.9 million during the three months ended March 31, 2024 and 2023, 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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