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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Fair Value Assumptions | The assumptions used for valuing the SARs granted in 2012 included the following:
Assumptions |  | 2012 SARs
Market closing price of the Common Stock |  | $ | 16.50 |
Exercise price |  | $ | 22.07 |
Risk-free interest rate |  | 0.92 | %
Expected volatility |  | 55.0 | %
Expected term |  | 6 years |
Dividend yield |  | — | %
The assumptions used for valuing the February 2016 SAR awards included the following:
Assumptions |  | February 2016 SAR awards
Market closing price of the Common Stock |  | $ | 10.76 |
Exercise price |  | $ | 11.25 |
Risk-free interest rate |  | 1.36 | %
Estimated price volatility |  | 55.0 | %
Expected term |  | 5.75 years |
Dividend yield |  | — | %
The assumptions used for valuing the incremental compensation related to the modification included the following:
Assumptions |  | Pre-Modification |  | Post-Modification
Market closing price of the Common Stock |  | $ | 53.64 |  |  | $ | 51.13 |
Exercise price |  | $ | 22.07 |  |  | $ | 22.07 |
Risk-free interest rate |  | 1.10 | % |  | 1.53 | %
Expected volatility |  | 50.0 | % |  | 50.0 | %
Expected term |  | 3.5 years |  |  | 4.9 years |
Dividend yield |  | — | % |  | — | %
Fair value of the Common Stock |  | $ | 31.97 |  |  | $ | 33.81 |
The assumptions used for valuing the 2017 SARs included the following:
Assumptions |  | 2017 SARs
Market closing price of the Common Stock |  | $ | 7.37 |
Exercise price |  | $ | 7.37 |
Risk-free interest rate |  | 2.1 | %
Estimated price volatility |  | 58.5 | %
Expected term |  | 6.00 years |
Dividend yield |  | — | %
The assumptions used for valuing the SARs granted in 2015 included the following:
Assumptions |  | 2015 SARs
Market closing price of the Common Stock |  | $ | 24.41 |
Exercise price |  | $ | 24.41 |
Risk-free interest rate |  | 1.76 | %
Expected volatility |  | 50.0 | %
Expected term |  | 7.25 years |
Dividend yield |  | — | %
Schedule of SAR Activity | SAR activity consisted of the following:
Number of Shares under SARs |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2013 |  | 362,581 |  |  | $ | 22.07 |  |  | 8.44 |  | $ | 19,228 |
Granted |  | — |  |  | — |  |  |  |  | — |
Exercised |  | (120,000 | ) |  | 22.07 |  |  |  |  | 6,673 |
Forfeited |  | — |  |  | — |  |  |  |  | — |
Expired |  | — |  |  | — |  |  |  |  | — |
Outstanding at December 31, 2014 |  | 242,581 |  |  | 22.07 |  |  | 7.44 |  | 7,166 |
Exercisable at December 31, 2014 |  | 61,291 |  |  | $ | 22.07 |  |  | 7.44 |  | $ | 1,811 |
Number of Shares under SARs |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2014 |  | 242,581 |  |  | $ | 22.07 |  |  | 7.44 |  | $ | 7,166 |
Granted |  | 60,000 |  |  | 24.41 |  |  |  |  | — |
Exercised |  | — |  |  | — |  |  |  |  | — |
Forfeited |  | — |  |  | — |  |  |  |  | — |
Expired |  | — |  |  | — |  |  |  |  | — |
Outstanding at December 31, 2015 |  | 302,581 |  |  | 22.53 |  |  | 7.10 |  | — |
Exercisable at December 31, 2015 |  | 61,291 |  |  | $ | 22.07 |  |  | 6.44 |  | $ | — |
Number of Shares under SARs |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2015 |  | 302,581 |  |  | $ | 22.53 |  |  | 7.10 |  | $ | — |
Granted |  | 106,800 |  |  | 11.43 |  |  |  |  | — |
Exercised |  | — |  |  | — |  |  |  |  | — |
Forfeited |  | (195,490 | ) |  | 21.28 |  |  |  |  | — |
Expired |  | (61,291 | ) |  | 22.07 |  |  |  |  | — |
Outstanding at December 31, 2016 |  | 152,600 |  |  | 16.55 |  |  | 9.02 |  | — |
Exercisable at December 31, 2016 |  | — |  |  | $ | — |  |  |  |  | $ | — |
Number of Shares under SARs |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016 |  | 152,600 |  |  | $ | 16.55 |  |  | 9.02 |  | $ | — |
Granted |  | 5,000 |  |  | 7.37 |  |  |  |  | — |
Exercised |  | — |  |  | — |  |  |  |  | — |
Forfeited |  | (67,130 | ) |  | 23.16 |  |  |  |  | — |
Expired |  | (6,750 | ) |  | 12.68 |  |  |  |  | — |
Outstanding at December 31, 2017 |  | 83,720 |  |  | 11.02 |  |  | 8.21 |  | 1,000 |
Exercisable at December 31, 2017 |  | 39,360 |  |  | $ | 11.25 |  |  | 8.15 |  | $ | — |
Schedule of Restricted Stock Activity | Restricted stock activity consisted of the following:
|  | Shares |  | Weighted-Average Grant Date Fair Value
Balance as of December 31, 2013 |  | 162,993 |  |  | $ | 39.29 |
Granted |  | 23,000 |  |  | 71.47 |
Forfeited |  | (12,000 | ) |  | 60.44 |
Vested |  | (19,742 | ) |  | 41.89 |
Balance as of December 31, 2014 |  | 154,251 |  |  | 42.11 |
Granted |  | 1,000 |  |  | 28.48 |
Forfeited |  | (800 | ) |  | 65.51 |
Vested |  | (24,207 | ) |  | 42.63 |
Balance as of December 31, 2015 |  | 130,244 |  |  | 41.77 |
Granted |  | 750 |  |  | 18.50 |
Forfeited |  | (4,668 | ) |  | 36.00 |
Vested |  | (21,986 | ) |  | 42.96 |
Balance as of December 31, 2016 |  | 104,340 |  |  | 41.61 |
Granted |  | 437,472 |  |  | 8.13 |
Forfeited |  | (29,144 | ) |  | 38.33 |
Vested |  | (16,395 | ) |  | 44.19 |
Balance as of December 31, 2017 |  | 496,273 |  |  | $ | 12.20 |

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