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Stock-Related Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017:
|  | For the Year Ended December 31, 2017 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 6,930,306 |  |  |  | 15.37 |
Granted |  |  | 2,956,249 |  |  |  | 15.16 |
Vested |  |  | (3,867,828 | ) |  |  | 15.19 |
Cancelled |  |  | (444,560 | ) |  |  | 15.55 |
Unvested at end of year |  |  | 5,574,167 |  |  |  | 15.38 |

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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=96867065&loc=d3e5070-113901 + Details
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