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Equity Compensation Plans | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Equity Compensation Plans | Equity Compensation Plans At March 31, 2022 and December 31, 2021, 5,708,420 and 5,958,390 shares of common stock, respectively, were available for grant under our Incentive Plan. The unamortized compensation cost of awards issued under the Incentive Plan, which are settled by delivery of shares of common stock and purchases under the Employee Stock Purchase Plan, totaled $44 million at March 31, 2022, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  |  |  | Three Months Ended March 31, 2022
(In Thousands) |  |  |  | Restricted Stock Awards |  | Restricted Stock Units |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  |  |  | $ | 84 |  |  | $ | 3,589 |  |  | $ | 26,473 |  |  | $ | 12,237 |  |  | $ | — |  |  | $ | 42,383 |
Equity grants |  |  |  | — |  |  | 2,484 |  |  | 3,850 |  |  | — |  |  | 323 |  |  | 6,657 |
Performance-based valuation adjustment |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Equity grant forfeitures |  |  |  | (5) |  |  | (242) |  |  | — |  |  | — |  |  | — |  |  | (247) |
Equity compensation expense |  |  |  | (66) |  |  | (471) |  |  | (2,949) |  |  | (1,258) |  |  | (81) |  |  | (4,825) |
Unrecognized Compensation Cost at End of Period |  |  |  | $ | 13 |  |  | $ | 5,360 |  |  | $ | 27,374 |  |  | $ | 10,979 |  |  | $ | 242 |  |  | $ | 43,968 |
At March 31, 2022, the weighted average amortization period remaining for all of our equity awards was less than two years. Restricted Stock Awards ("RSAs") At March 31, 2022 and December 31, 2021, there were 1,551 and 28,141 shares of RSAs outstanding, respectively. Restrictions on these shares lapse during 2022. During the three months ended March 31, 2022, there were no RSAs granted, restrictions on 26,249 RSAs lapsed and those shares were distributed, and 341 RSAs were forfeited. Restricted Stock Units ("RSUs") At March 31, 2022 and December 31, 2021, there were 498,223 and 431,072 RSUs outstanding, respectively. During the three months ended March 31, 2022, there were 206,179 RSUs granted, 117,725 RSUs distributed, and 21,303 RSUs forfeited. Unvested RSUs at March 31, 2022 vest through 2026. Deferred Stock Units (“DSUs”) At March 31, 2022 and December 31, 2021, there were 4,526,420 and 4,022,088 DSUs outstanding, respectively, of which 1,965,990 and 1,469,903, respectively, had vested. During the three months ended March 31, 2022, there were 645,870 DSUs granted, 141,538 DSUs distributed, and zero DSUs forfeited. Unvested DSUs at March 31, 2022 vest through 2026. Performance Stock Units (“PSUs”) At March 31, 2022 and December 31, 2021, the target number of PSUs that were unvested was 1,267,849 and 1,473,883, respectively. Vesting for PSUs generally occurs three years from their respective grant dates based on various total shareholder return performance calculations, as discussed in Note 18 to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2021. For 206,034 target PSU awards that were granted in December 2018, the performance vesting period ended on January 1, 2022. These 2018 PSU awards failed to reach a threshold level under their performance-based vesting criteria and resulted in the vesting of no shares of our common stock underlying these PSUs. Employee Stock Purchase Plan ("ESPP") The ESPP allows a maximum of 850,000 shares of common stock to be purchased in aggregate for all employees. As of March 31, 2022 and December 31, 2021, 586,762 and 569,728 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at March 31, 2022.

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