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Equity Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2023
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 $42 million at March 31, 2023, as shown in the following table. Table 19.1 – Activities of Equity Compensation Costs by Award Type
|  |  |  |  |  | Three Months Ended March 31, 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 |  |  |  |  |  | 1,982 |  |  | 5,950 |  |  | — |  |  | 422 |  |  | 8,354 |
Equity grant forfeitures |  |  |  |  |  | (174) |  |  | — |  |  | — |  |  | — |  |  | (174) |
Equity compensation expense |  |  |  |  |  | (1,420) |  |  | (2,930) |  |  | (1,734) |  |  | (106) |  |  | (6,190) |
Unrecognized Compensation Cost at End of Period |  |  |  |  |  | $ | 5,456 |  |  | $ | 22,869 |  |  | $ | 13,537 |  |  | $ | 316 |  |  | $ | 42,178 |

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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