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Equity Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 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 $32 million at March 31, 2020, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  | Three Months Ended March 31, 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 |  | 5 |  |  | 3,352 |  |  | 5,480 |  |  | — |  |  | 160 |  |  | 8,997 |
Performance-based valuation adjustment |  | — |  |  | — |  |  | — |  |  | (7,352 | ) |  | — |  |  | (7,352 | )
Equity grant forfeitures |  | (24 | ) |  | (114 | ) |  | — |  |  | — |  |  | — |  |  | (138 | )
Equity compensation expense |  | (344 | ) |  | (347 | ) |  | (1,993 | ) |  | 729 |  |  | (40 | ) |  | (1,995 | )
Unrecognized Compensation Cost at End of Period |  | $ | 1,627 |  |  | $ | 6,425 |  |  | $ | 21,345 |  |  | $ | 2,323 |  |  | $ | 120 |  |  | $ | 31,840 |

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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=116856206&loc=d3e5070-113901 + Details
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