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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Summary of Activity for Restricted Stock Awards | The following table provides a summary of activity with regard to restricted stock awards in the six months ended June 30, 2017:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 6,930,306 |  |  | $ | 15.37 |
Granted |  |  | 2,818,749 |  |  |  | 15.27 |
Vested |  |  | (2,193,074 | ) |  |  | 15.01 |
Canceled |  |  | (94,300 | ) |  |  | 15.67 |
Unvested at end of period |  |  | 7,461,681 |  |  |  | 15.44 |

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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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Period Type: | duration