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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation [Abstract] |
Schedule of restricted stock award and unit activity | The following table summarizes restricted stock activity for the twelve months ended December 31, 2018, 2017 and 2016:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2016 | 484,239 |  |  | $ | 43.51 |
Granted | 451,241 |  |  | 27.78 |
Vested | (252,566 | ) |  | 43.94 |
Forfeited | (69,858 | ) |  | 33.43 |
Unvested shares as of December 31, 2016 | 613,056 |  |  | $ | 32.90 |
Granted | 876,846 |  |  | $ | 15.14 |
Vested | (423,977 | ) |  | 29.90 |
Forfeited | (89,898 | ) |  | 27.91 |
Unvested shares as of December 31, 2017 | 976,027 |  |  | $ | 18.71 |
Granted | 1,579,911 |  |  | 9.90 |
Vested | (626,671 | ) |  | 18.05 |
Forfeited | (393,456 | ) |  | 12.23 |
Unvested shares as of December 31, 2018 | 1,535,811 |  |  | $ | 11.57 |

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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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