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Equity Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of 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 $41 million at March 31, 2024, as shown in the following table. Table 19.1 – Activities of Equity Compensation Costs by Award Type
|  |  |  |  |  | Three Months Ended March 31, 2024
(In Thousands) |  |  |  |  |  | Restricted Stock Units |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  |  |  |  |  | $ | 3,166 |  |  | $ | 18,920 |  |  | $ | 15,519 |  |  | $ | — |  |  | $ | 37,605 |
Equity grants |  |  |  |  |  | 3,522 |  |  | 6,915 |  |  | — |  |  | 266 |  |  | 10,703 |
Performance-based valuation adjustment |  |  |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Equity grant forfeitures (1) |  |  |  |  |  | (401) |  |  | (1,114) |  |  | — |  |  | — |  |  | (1,515) |
Equity compensation expense |  |  |  |  |  | (711) |  |  | (3,172) |  |  | (1,785) |  |  | (67) |  |  | (5,735) |
Unrecognized Compensation Cost at End of Period |  |  |  |  |  | $ | 5,576 |  |  | $ | 21,549 |  |  | $ | 13,734 |  |  | $ | 199 |  |  | $ | 41,058 |
(1)Equity grant forfeitures for the three months ended March 31, 2024 represent the reduction in future equity compensation expense related to employee terminations, for which the underlying equity awards will be forfeited upon the actual employee termination date subsequent to March 31, 2024.

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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 -Topic 718 -SubTopic 10 -Subparagraph (i) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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