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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Non-Vested Restricted Stock Units | Non-vested RSUs outstanding as of December 31, 2020 and the changes during the year were as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2019 | 2,460,800 |  |  | $ | 6.65 |
Granted | 2,928,737 |  |  | 3.38 |
Vested | (1,465,069) |  |  | 6.58 |
Forfeited | (325,569) |  |  | 4.95 |
Non-vested at December 31, 2020 | 3,598,899 |  |  | $ | 4.18 |
Schedule of Weighted Average Assumptions for PRSUs | The weighted average assumptions for the PRSUs granted in 2020 are as follows:
| 2020
Total expected term (in years) | 2.87
Expected volatility | 46.2%
Risk-free interest rate | 1.36%
Correlation range | 17.4% to 82.9%
The weighted average assumptions for the PRSUs granted in 2019 are as follows:
| 2019
Expected term (in years) | 2.86
Expected volatility | 43.5%
Risk-free interest rate | 2.48%
Correlation range | 2.4% to 88.1%
The weighted average assumptions for the PRSUs granted in 2018 are as follows:
| 2018
Expected term (in years) | 2.86
Expected volatility | 39.0%
Risk-free interest rate | 2.35%
Correlation range | 11.0% to 85.7%
Schedule of Non-Vested PRSU's Outstanding | Non-vested PRSUs outstanding as of December 31, 2020, and the changes during the year were as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2019 | 788,833 |  |  | $ | 8.13 |
Granted | 676,615 |  |  | 4.40 |
Vested | (163,750) |  |  | 9.04 |
Forfeited | (14,611) |  |  | 7.79 |
Non-vested at December 31, 2020 | 1,287,087 |  |  | $ | 5.96 |

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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