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Equity-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Restricted and Performance Share-Based Activity | A summary of non-vested restricted share-based activity for the years ended December 31, 2020, 2019, and 2018 follows:
|  | Unvested Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 |  | 574,456 |  |  | $ | 15.95 |
Granted/Earned |  | 519,605 |  |  | 16.10 |
Forfeited/Cancelled |  | (180,719) |  |  | 15.09 |
Vested |  | (210,318) |  |  | 16.31 |
Outstanding at December 31, 2018 |  | 703,024 |  |  | $ | 16.18 |
Granted/Earned |  | 801,751 |  |  | 12.70 |
Forfeited/Cancelled |  | (272,706) |  |  | 12.97 |
Vested |  | (456,183) |  |  | 16.20 |
Outstanding at December 31, 2019 |  | 775,886 |  |  | $ | 13.78 |
Granted/Earned |  | 1,387,059 |  |  | 6.87 |
Forfeited/Cancelled |  | (162,635) |  |  | 13.77 |
Vested |  | (552,943) |  |  | 12.78 |
Outstanding at December 31, 2020 |  | 1,447,367 |  |  | $ | 9.75 |
Schedule of Stock Options, Valuation Assumptions | The following table sets forth the assumptions used by the Company to estimate the fair value of stock options and SAR Awards granted during the years ended December 31, 2019 and 2018. No stock options or SAR Awards were granted during the year ended December 31, 2020.
|  | 2019 |  | 2018
Expected volatility |  | 60 | % |  | 60% - 65%
Risk-free interest rate |  | 2.30% - 2.40% |  | 2.50% - 2.90%
Expected dividends |  | — |  |  | — |
Average expected term (years) |  | 4 |  | 10
Fair value of stock options granted |  | $4.83 - $6.41 |  | $8.48 - $9.44
Schedule of Stock Options Activity | A summary of stock option and SAR Award activity for the years ended December 31, 2020, 2019, and 2018 follows:
|  | Options/SARs |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years)
Outstanding at December 31, 2017 |  | 12,687 |  |  | $ | 20.10 |  |  | 1.2
Granted |  | 700,000 |  |  | 12.90 |  |  | 10.0
Exercised |  | — |  |  |  |  |
Forfeited/Cancelled |  | (200,000) |  |  | 12.90 |  |  | 10.0
Outstanding at December 31, 2018 |  | 512,687 |  |  | $ | 13.03 |  |  | 9.8
Granted |  | 2,256,500 |  |  | 13.00 |  |  | 9.2
Exercised |  | — |  |  |  |  |
Forfeited/Cancelled |  | — |  |  |  |  |
Outstanding at December 31, 2019 |  | 2,769,187 |  |  | $ | 13.02 |  |  | 9.0
Granted |  | — |  |  |  |  |
Exercised |  | (4,199) |  |  | 20.24 |  |  | 5.8
Forfeited/Cancelled |  | (4,473) |  |  | 19.00 |  |  | 4.8
Outstanding at December 31, 2020 (1) |  | 2,760,515 |  |  | $ | 12.88 |  |  | 8.0
(1) Of the outstanding stock options, 585,119 were exercisable as of December 31, 2020.

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