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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Summary of Activity for Restricted Stock Awards | The following table provides a summary of activity with regard to restricted stock awards in the three months ended March 31, 2018:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 5,574,167 |  |  | $ | 15.38 |
Granted |  |  | 2,420,523 |  |  |  | 13.61 |
Vested |  |  | (615,482 | ) |  |  | 15.30 |
Canceled |  |  | (72,380 | ) |  |  | 14.92 |
Unvested at end of period |  |  | 7,306,828 |  |  |  | 14.80 |

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration