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Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 $19 million at September 30, 2018, as shown in the following table. Table 17.1 – Activities of Equity Compensation Costs by Award Type
|  | Nine Months Ended September 30, 2018
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 2,808 |  |  | $ | 13,364 |  |  | $ | 5,298 |  |  | $ | — |  |  | $ | 21,470 |
Equity grants |  | 2,391 |  |  | 4,750 |  |  | 350 |  |  | 136 |  |  | 7,627 |
Equity grant forfeitures |  | (112 | ) |  | — |  |  | — |  |  | — |  |  | (112 | )
Equity compensation expense |  | (1,245 | ) |  | (6,264 | ) |  | (1,954 | ) |  | (102 | ) |  | (9,565 | )
Unrecognized Compensation Cost at End of Period |  | $ | 3,842 |  |  | $ | 11,850 |  |  | $ | 3,694 |  |  | $ | 34 |  |  | $ | 19,420 |

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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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=109197908&loc=d3e5070-113901 + Details
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