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Equity Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Equity Compensation Costs by Award Type | The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $23 million at June 30, 2020, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  |  |  | Six Months Ended June 30, 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 |  |  |  | 70 |  |  | 3,431 |  |  | 6,593 |  |  | — |  |  | 160 |  |  | 10,254 |
Performance-based valuation adjustment |  |  |  | — |  |  | — |  |  | — |  |  | (7,352) |  |  | — |  |  | (7,352) |
Equity grant forfeitures |  |  |  | (349) |  |  | (1,266) |  |  | (4,733) |  |  | (648) |  |  | — |  |  | (6,996) |
Equity compensation expense |  |  |  | (614) |  |  | (772) |  |  | (4,511) |  |  | 720 |  |  | (80) |  |  | (5,257) |
Unrecognized Compensation Cost at End of Period |  |  |  | $ | 1,097 |  |  | $ | 4,927 |  |  | $ | 15,207 |  |  | $ | 1,666 |  |  | $ | 80 |  |  | $ | 22,977 |

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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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