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Equity Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
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 June 30, 2017, as shown in the following table. Table 16.1 – Activities of Equity Compensation Costs by Award Type
|  | Six Months Ended June 30, 2017
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 2,091 |  |  | $ | 11,506 |  |  | $ | 4,549 |  |  | $ | — |  |  | $ | 18,146 |
Equity grants |  | 2,237 |  |  | 4,547 |  |  | — |  |  | 129 |  |  | 6,913 |
Equity grant forfeitures |  | (174 | ) |  | (472 | ) |  | — |  |  | — |  |  | (646 | )
Equity compensation expense |  | (602 | ) |  | (3,472 | ) |  | (1,159 | ) |  | (64 | ) |  | (5,297 | )
Unrecognized Compensation Cost at End of Period |  | $ | 3,552 |  |  | $ | 12,109 |  |  | $ | 3,390 |  |  | $ | 65 |  |  | $ | 19,116 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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