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Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
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 $30 million at September 30, 2023, as shown in the following table. Table 19.1 – Activities of Equity Compensation Costs by Award Type
|  |  |  |  |  | Nine Months Ended September 30, 2023
(In Thousands) |  |  |  |  |  | Restricted Stock Units |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  |  |  |  |  | $ | 5,068 |  |  | $ | 19,849 |  |  | $ | 15,271 |  |  | $ | — |  |  | $ | 40,188 |
Equity grants |  |  |  |  |  | 2,092 |  |  | 6,865 |  |  | — |  |  | 422 |  |  | 9,379 |
Performance-based valuation adjustment |  |  |  |  |  | — |  |  | — |  |  | (3,205) |  |  | — |  |  | (3,205) |
Equity grant forfeitures |  |  |  |  |  | (1,088) |  |  | (719) |  |  | — |  |  | — |  |  | (1,807) |
Equity compensation expense |  |  |  |  |  | (2,411) |  |  | (8,911) |  |  | (2,895) |  |  | (318) |  |  | (14,535) |
Unrecognized Compensation Cost at End of Period |  |  |  |  |  | $ | 3,661 |  |  | $ | 17,084 |  |  | $ | 9,171 |  |  | $ | 104 |  |  | $ | 30,020 |

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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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