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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Share-based Compensation [Abstract] |
Summary of Restricted Stock Award and Unit Activity | The following table summarizes restricted stock activity for the six months ended June 30, 2017:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2017 | 613,056 |  |  | $ | 32.90 |
Granted | 525,808 |  |  | 17.31 |
Vested | (172,988 | ) |  | 32.06 |
Forfeited | (66,661 | ) |  | 31.18 |
Unvested shares as of June 30, 2017 | 899,215 |  |  | $ | 24.08 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- References No definition available. + Details
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