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Share-Based Compensation | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation | Share-Based Compensation The Company recognized the following share-based compensation expense in its Condensed Consolidated Statements of Operations:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Stock options | $ | 203 |  | $ | 533 |  | $ | 837 |  | $ | 1,269
Non-vested stock awards and restricted stock units | 2,429 |  | 1,783 |  | 7,192 |  | 4,998
Director stock ownership plan | 30 |  | 9 |  | 56 |  | 53
Performance stock units | 1,113 |  | 875 |  | 3,104 |  | 2,314
Total share-based compensation expense | $ | 3,775 |  | $ | 3,200 |  | $ | 11,189 |  | $ | 8,634
Share-based compensation expense is recorded in SG&A, except for $0.1 million and $0.2 million for the three and nine months ended September 30, 2022, respectively, recorded within Combination, integration and other acquisition-related expenses. Stock Options As of September 30, 2023, unrecognized compensation expense related to unvested stock options was $0.5 million, to be recognized over a weighted average remaining period of 0.9 years. Restricted Stock Awards and Restricted Stock Units During the nine months ended September 30, 2023, the Company granted 38,894 non-vested restricted shares and 6,675 non-vested restricted stock units under its long-term incentive plan (“LTIP”), which are subject to time-based vesting, generally over one to three years. The fair value of these grants is based on the last sale price of the Company’s common stock on the date of grant. As of September 30, 2023, unrecognized compensation expense related to the non-vested restricted shares was $8.0 million, to be recognized over a weighted average remaining period of 1.4 years, and unrecognized compensation expense related to non-vested restricted stock units was $1.6 million, to be recognized over a weighted average remaining period of 1.5 years. Performance Stock Units As a component of its LTIP, the Company grants performance-based stock unit awards (“PSUs”), which will be settled in a certain number of shares subject to market-based or performance-based and time-based vesting conditions. The number of fully vested shares that may ultimately be issued as settlement for each award may range from 0% up to 200% of the target award, subject to the achievement of the Company’s market-based total shareholder return (“TSR”) metric relative to the performance of the Company’s peer group, the S&P Midcap 400 Materials group, and separately the achievement of a performance-based return on invested capital (“ROIC”) measure. The service period required for the PSUs is generally three years and the measurement period of the market-based and performance objectives is generally from January 1 of the year of grant through December 31 of the year prior to issuance of the shares. Compensation expense for PSUs is measured based on the grant date fair value and is recognized on a straight-line vesting method basis over the applicable vesting period. The fair value of PSUs granted with a ROIC condition is based on the trading price of the Company’s common stock on the date of grant. PSUs granted with a relative TSR condition are valued using a Monte Carlo simulation on the date of grant. The grant-date fair value of the PSUs valued using a Monte Carlo simulation, which included the following assumptions set forth in the table below:
| 2023 Grants
Number of PSUs granted | 16,861
Risk-free interest rate | 3.85%
Dividend yield | 0.96%
Expected term (years) | 3.0
Based on the conditions of the PSUs and performance to date for each of the outstanding PSU awards as of September 30, 2023, the Company estimates that it will issue 25,613 fully vested shares as of the applicable settlement date for such outstanding PSUs awards. As of September 30, 2023, there was approximately $8.0 million of total unrecognized compensation cost related to PSUs, which the Company expects to recognize over a weighted-average period of 2.2 years.

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