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Equity Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 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 $22 million at March 31, 2017, as shown in the following table. Table 16.1 – Activities of Equity Compensation Costs by Award Type
|  | Three Months Ended March 31, 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 |  | 2,234 |  |  | 3,725 |  |  | — |  |  | 129 |  |  | 6,088 |
Equity grant forfeitures |  | (122 | ) |  | — |  |  | — |  |  | — |  |  | (122 | )
Equity compensation expense |  | (267 | ) |  | (1,298 | ) |  | (579 | ) |  | (32 | ) |  | (2,176 | )
Unrecognized Compensation Cost at End of Period |  | $ | 3,936 |  |  | $ | 13,933 |  |  | $ | 3,970 |  |  | $ | 97 |  |  | $ | 21,936 |

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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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