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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
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, 2019:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 6,904,388 |  |  | $ | 14.74 |
Granted |  |  | 1,743,240 |  |  |  | 10.32 |
Vested |  |  | (2,038,655 | ) |  |  | 15.25 |
Canceled |  |  | (89,500 | ) |  |  | 12.90 |
Unvested at end of period |  |  | 6,519,473 |  |  |  | 13.43 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration