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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Restricted Stock Activity | A summary of restricted stock activity for the year ended December 31, 2016 is presented below:
| Number of Restricted Shares |  |  |  | Weighted Average Grant Price |
Outstanding at January 1, 2016 |  | 314,048 |  |  |  | $49.57 |
Granted |  | 237,187 |  |  |  | $5.46 |
Vested |  | (191,004 | ) |  |  | $58.80 |
Forfeitures |  | (5,245 | ) |  |  | $32.07 |
Outstanding at December 31, 2016 |  | 354,986 |  |  |  | $15.60 |
Summary of Significant Assumptions Use to Value PSUs | Significant assumptions use to value PSUs in 2014, 2015 and 2016 included:
|  | For the Years Ended December 31, |
|  | 2014 |  |  | 2015 |  |  | 2016 |
Risk free interest rate |  |  | 0.6% |  |  |  | 1.1% |  |  |  | 0.9% |
Range of implied volatility: |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  | 38% |  |  |  | 37% |  |  |  | 47% |
Maximum |  |  | 70% |  |  |  | 65% |  |  |  | 92% |
Summary of PSU Activity | A summary of PSU activity for the year ended December 31, 2016 is presented below:
|  | Number of PSUs |  |  |  | Weighted Average Grant Price |
Outstanding at January 1, 2016 |  | 133,931 |  |  |  | $45.27 |
Granted |  | 60,015 |  |  |  | $7.00 |
Earned |  | (7,540 | ) |  |  | $21.90 |
Unearned or forfeited |  | (51,756 | ) |  |  | $64.40 |
Outstanding at December 31, 2016 |  | 134,650 |  |  |  | $22.17 |
Stock Option Activity under Company's 2009 Long-term Incentive Plan | The following table summarizes information related to stock option activity under the Company's 2009 Long-term Incentive Plan for the year ended December 31, 2016:
| Number of Options |  |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2016 |  | 11,730 |  |  |  | $166.10 |
Expired |  | (11,730 | ) |  |  | $166.10 |
Outstanding at December 31, 2016 |  | — |  |  |  | $— |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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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