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Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity Compensation Plans | The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $20 million at September 30, 2015, as shown in the following table. Table 17.1 – Activities of Equity Compensation Costs by Award Type
|  | Nine Months Ended September 30, 2015
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 1,091 |  |  | $ | 12,304 |  |  | $ | 6,874 |  |  | $ | — |  |  | $ | 20,269 |
Equity grants |  | 2,758 |  |  | 5,997 |  |  | — |  |  | 236 |  |  | 8,991 |
Equity grant forfeitures |  | (387 | ) |  | (169 | ) |  | — |  |  | — |  |  | (556 | )
Equity compensation expense |  | (813 | ) |  | (5,561 | ) |  | (2,563 | ) |  | (175 | ) |  | (9,112 | )
Unrecognized Compensation Cost at End of Period |  | $ | 2,649 |  |  | $ | 12,571 |  |  | $ | 4,311 |  |  | $ | 61 |  |  | $ | 19,592 |

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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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