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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018:
|  |  |  | Weighted Average
|  |  |  | Grant Date
|  | Number of Shares |  | Fair Value
Unvested at beginning of year |  |  |  | 5,574,167 |  |  |  |  | $15.38 |
Granted |  |  |  | 2,458,523 |  |  |  |  | 13.59 |
Vested |  |  |  | (697,482 | ) |  |  |  | 15.20 |
Canceled |  |  |  | (134,420 | ) |  |  |  | 15.01 |
Unvested at end of period |  |  |  | 7,200,788 |  |  |  |  | 14.79 |

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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
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration