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Equity Compensation Plans | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Equity Compensation Plans | Equity Compensation Plans At March 31, 2020 and December 31, 2019, 3,326,806 and 3,637,480 shares of common stock, respectively, were available for grant under our Incentive Plan. The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $32 million at March 31, 2020, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  | Three Months Ended March 31, 2020
(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 |  | $ | 1,990 |  |  | $ | 3,534 |  |  | $ | 17,858 |  |  | $ | 8,946 |  |  | $ | — |  |  | $ | 32,328 |
Equity grants |  | 5 |  |  | 3,352 |  |  | 5,480 |  |  | — |  |  | 160 |  |  | 8,997 |
Performance-based valuation adjustment |  | — |  |  | — |  |  | — |  |  | (7,352 | ) |  | — |  |  | (7,352 | )
Equity grant forfeitures |  | (24 | ) |  | (114 | ) |  | — |  |  | — |  |  | — |  |  | (138 | )
Equity compensation expense |  | (344 | ) |  | (347 | ) |  | (1,993 | ) |  | 729 |  |  | (40 | ) |  | (1,995 | )
Unrecognized Compensation Cost at End of Period |  | $ | 1,627 |  |  | $ | 6,425 |  |  | $ | 21,345 |  |  | $ | 2,323 |  |  | $ | 120 |  |  | $ | 31,840 |
At March 31, 2020, the weighted average amortization period remaining for all of our equity awards was two years. Restricted Stock Awards ("RSAs") At March 31, 2020 and December 31, 2019, there were 113,836 and 216,470 shares, respectively, of RSAs outstanding. Restrictions on these shares lapse through 2022. During the three months ended March 31, 2020, there were no RSAs granted, restrictions on 101,063 RSAs lapsed and those shares were distributed, and 1,571 RSAs were forfeited. Restricted Stock Units ("RSUs") At March 31, 2020 and December 31, 2019, there were 409,311 and 275,173 shares, respectively, of RSUs outstanding. Restrictions on these shares lapse through 2024. During the three months ended March 31, 2020, there were 190,624 RSUs granted, 49,385 RSUs distributed, and 7,101 RSUs forfeited. Deferred Stock Units (“DSUs”) At March 31, 2020 and December 31, 2019, there were 2,721,349 and 2,630,805 DSUs, respectively, outstanding of which 1,218,304 and 1,286,063, respectively, had vested. During the three months ended March 31, 2020, there were 310,473 DSUs granted, 219,929 DSUs distributed, and no DSUs forfeited. Unvested DSUs at March 31, 2020 vest through 2024. Performance Stock Units (“PSUs”) At both March 31, 2020 and December 31, 2019, the target number of PSUs that were unvested was 839,070. Vesting for all PSUs will generally occur at the end of three years from their grant date based on various TSR performance calculations, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2019. During the three months ended March 31, 2020, we adjusted our vesting estimate of certain PSUs to reflect updated assumptions regarding performance-based vesting and recorded a reversal of $1 million of stock-based compensation expense recorded in prior quarters. Employee Stock Purchase Plan ("ESPP") The ESPP allows a maximum of 600,000 shares of common stock to be purchased in aggregate for all employees. As of March 31, 2020 and December 31, 2019, 452,021 and 430,772 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at March 31, 2020.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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