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Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Nonvested Restricted Shares and RSUs Activity | The following table summarizes nonvested restricted shares and RSUs activity for the nine months ended September 30, 2018:
Nonvested restricted shares and RSUs |  | Shares |  | Weighted-average grant date fair value
Nonvested at December 31, 2017 |  | 2,340,892 |  |  | $ | 15.08 |
Forfeited |  | (382,371 | ) |  | 17.32 |
Vested |  | (461,097 | ) |  | 18.29 |
Granted |  | 636,322 |  |  | 17.07 |
Nonvested at September 30, 2018 |  | 2,133,746 |  |  | $ | 15.02 |

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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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