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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Summary of Stock Option Activity | A summary of the status of stock options and related activity for the years ended December 31, 2017, 2016 and 2015 is presented below:
| Shares |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (In thousands)
Options outstanding at January 1, 2015 | 5,000 |  |  | $ | 9.07 |  |  | 0.69 |  |  | $ | 163 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (5,000 | ) |  | 9.07 |  |  |  |  | 124 |
Forfeited/expired | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2015 | — |  |  | — |  |  | — |  |  | $ | — |
Granted | — |  |  | — |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  | — |
Forfeited/expired | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2016 | — |  |  | — |  |  | — |  |  | $ | — |
Granted | — |  |  | — |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  | — |
Forfeited/expired | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2017 | — |  |  | $ | — |  |  | — |  |  | $ | — |
Options exercisable at December 31, 2017 | — |  |  | $ | — |  |  | — |  |  | $ | — |
Summary of Restricted Stock Award and Unit Activity | The following table summarizes restricted stock activity for the twelve months ended December 31, 2017, 2016 and 2015:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2015 | 387,245 |  |  | $ | 55.87 |
Granted | 352,605 |  |  | 35.99 |
Vested | (236,812 | ) |  | 52.39 |
Forfeited | (18,799 | ) |  | 45.21 |
Unvested shares as of December 31, 2015 | 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 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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