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Equity Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Equity Compensation Costs by Award Type | 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 $29 million at March 31, 2021, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  |  |  | Three Months Ended March 31, 2021
(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 |  |  |  | $ | 564 |  |  | $ | 3,540 |  |  | $ | 17,766 |  |  | $ | 5,794 |  |  | $ | — |  |  | $ | 27,664 |
Equity grants |  |  |  | — |  |  | 2,370 |  |  | 2,641 |  |  | — |  |  | 259 |  |  | 5,270 |
Equity grant forfeitures |  |  |  | (2) |  |  | (591) |  |  | (550) |  |  | — |  |  | — |  |  | (1,143) |
Equity compensation expense |  |  |  | (167) |  |  | (307) |  |  | (1,761) |  |  | (586) |  |  | (65) |  |  | (2,886) |
Unrecognized Compensation Cost at End of Period |  |  |  | $ | 395 |  |  | $ | 5,012 |  |  | $ | 18,096 |  |  | $ | 5,208 |  |  | $ | 194 |  |  | $ | 28,905 |

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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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