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Stock-Based Compensation and Stock Awards (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of RSA Activity | The Company’s RSA activity and related information is presented below:
|  | Restricted Stock |  |  | Weighted- average Grant Date Fair Value |
Unvested at December 31, 2020 |  |  | 480,776 |  |  | $ | 30.20 |
Granted |  |  | 276,783 |  |  |  | 23.96 |
Vested |  |  | (265,840 | ) |  |  | 32.21 |
Forfeited |  |  | (26,684 | ) |  |  | 27.78 |
Unvested at December 31, 2021 |  |  | 465,035 |  |  | $ | 25.48 |
Schedule of Valuation Assumptions | Assumptions used in the Monte Carlo simulation are as follows:
|  | 2021 |  |  | 2020 |  |  | 2019 |
Grant date |  | October 28, 2021 |  |  | October 28, 2020 |  |  | October 28, 2019 |
Performance period |  | October 1, 2021 to September 30, 2024 |  |  | October 1, 2020 to September 30, 2023 |  |  | October 1, 2019 to September 30, 2022 |
Volatility |  | 56.1% |  |  | 50.9% |  |  | 38.8% |
Risk-free interest rate |  | 0.8% |  |  | 0.2% |  |  | 1.7% |
Grant date price |  | $ | 23.54 |  |  | $ | 23.86 |  |  | $ | 44.53 |
Summary of PSA Activity | The Company’s Performance Unit activity and related information is presented below:
|  | Number of Performance Units |  |  | Weighted Average Grant Date Fair Value Per Unit |
Unvested balance at December 31, 2020 |  |  | 330,967 |  |  | $ | 42.10 |
Granted |  |  | 96,111 |  |  |  | 29.88 |
Vested |  |  | (166,693 | ) |  |  | 45.52 |
Forfeited |  |  | (36,011 | ) |  |  | 38.92 |
Unvested balance at December 31, 2021 |  |  | 224,374 |  |  | $ | 34.83 |
Schedule of DSA Activity | The Company's DSA activity for the year ended December 31, 2021 is presented below:
|  | DSA Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested balance at December 31, 2020 |  |  | 62,196 |  |  | $ | 30.18 |
Granted |  |  | 52,455 |  |  |  | 25.61 |
Vested |  |  | (43,865 | ) |  |  | 29.94 |
Unvested balance at December 31, 2021 |  |  | 70,786 |  |  | $ | 26.94 |
Schedule of Information for Stock Option Plans | Equity Compensation Plan Information The following table summarizes information for equity compensation plans in effect as of December 31, 2021 :
|  | Number of securities to be issued upon exercise of outstanding options, warrants and rights (1) |  |  | Weighted- average exercise price of outstanding options, warrants and rights (2) |  |  | Number of securities remaining available for future issuance under equity compensation plan |
Plan category |  | (a) |  |  | (b) |  |  | (c) |
Equity compensation plans approved by stockholders |  |  | 224,374 |  |  | $ | 34.83 |  |  |  | 1,549,243 |
Total |  |  | 224,374 |  |  | $ | 34.83 |  |  |  | 1,549,243 |
(1) Excludes 535,821 shares of unvested RSAs and DSAs, which were granted pursuant to the 2017 Plan and the 2004 Plan. Includes 224,,374 unvested Performance Units shown at 100% level of performance achievement. (2) The weighted average exercise price does not take into account 224,374 unvested Performance Units, which do not have an exercise price.

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