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Stock-Related Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of Activity for Restricted Stock Awards | The following table provides a summary of activity with regard to restricted stock awards in the year ended December 31, 2015:
|  | For the Year Ended December 31, 2015 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 5,802,409 |  |  |  | $15.24 |
Granted |  |  | 2,352,641 |  |  |  | 15.83 |
Vested |  |  | (1,660,633 | ) |  |  | 15.29 |
Cancelled |  |  | (132,300 | ) |  |  | 15.28 |
Unvested at end of year |  |  | 6,362,117 |  |  |  | 15.44 |
Summary of Activity for Stock Option Plan | The status of the Stock Option Plan at December 31, 2015, and the changes that occurred during the year ended at that date, are summarized below:
|  | For the Year Ended December 31, 2015 |
|  | Number of Stock Options |  |  | Weighted Average Exercise Price |
Stock options outstanding, beginning of year |  |  | 58,560 |  |  |  | $18.04 |
Exercised |  |  | — |  |  |  | — |
Expired/forfeited |  |  | (56,160 | ) |  |  | 18.09 |
Stock options outstanding, end of year |  |  | 2,400 |  |  |  | 16.88 |
Options exercisable at year-end |  |  | 2,400 |  |  |  | 16.88 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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