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Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2016
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 $15 million at September 30, 2016, as shown in the following table. Table 17.1 – Activities of Equity Compensation Costs by Award Type
|  | Nine Months Ended September 30, 2016
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 2,393 |  |  | $ | 14,392 |  |  | $ | 6,823 |  |  | $ | — |  |  | $ | 23,608 |
Equity grants |  | 1,753 |  |  | 4,641 |  |  | — |  |  | 124 |  |  | 6,518 |
Equity grant forfeitures |  | (1,351 | ) |  | (1,167 | ) |  | (2,209 | ) |  | — |  |  | (4,727 | )
Equity compensation expense |  | (451 | ) |  | (7,922 | ) |  | (2,134 | ) |  | (93 | ) |  | (10,600 | )
Unrecognized Compensation Cost at End of Period |  | $ | 2,344 |  |  | $ | 9,944 |  |  | $ | 2,480 |  |  | $ | 31 |  |  | $ | 14,799 |

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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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