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Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
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 September 30, 2019, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  | Nine Months Ended September 30, 2019
(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 |  | $ | 3,498 |  |  | $ | 74 |  |  | $ | 14,489 |  |  | $ | 7,061 |  |  | $ | — |  |  | $ | 25,122 |
Equity grants |  | — |  |  | 3,483 |  |  | 4,831 |  |  | — |  |  | 160 |  |  | 8,474 |
Equity grant forfeitures |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Equity compensation expense |  | (1,137 | ) |  | (499 | ) |  | (5,871 | ) |  | (2,505 | ) |  | (120 | ) |  | (10,132 | )
Unrecognized Compensation Cost at End of Period |  | $ | 2,361 |  |  | $ | 3,058 |  |  | $ | 13,449 |  |  | $ | 4,556 |  |  | $ | 40 |  |  | $ | 23,464 |

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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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