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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Restricted Stock Unit and Stock Option Activity | The following table summarizes restricted stock unit and stock option activity:
| Restricted Stock Units |  | Stock Options
| Number |  | Weighted- Average Grant Date Fair Value Per Share |  | Number |  | Weighted- Average Exercise/ (Strike) Price Per Share
Outstanding as of December 31, 2017 | 1,397,984 |  |  | $ | 30.11 |  |  | 2,554,034 |  |  | $ | 20.45 |
Granted | 699,000 |  |  | 24.21 |  |  | 664,000 |  |  | 23.20 |
Expired or cancelled | (240,289) |  |  | 32.76 |  |  | (274,990) |  |  | 22.82 |
Vested/exercised | (387,695) |  |  | 28.67 |  |  | — |  |  | — |
Outstanding as of December 31, 2018 | 1,469,000 |  |  | $ | 27.27 |  |  | 2,943,044 |  |  | $ | 20.89 |
Granted | 530,000 |  |  | 20.23 |  |  | 220,000 |  |  | 19.66 |
Expired or cancelled | (104,029) |  |  | 28.98 |  |  | (884,029) |  |  | 21.03 |
Vested/exercised | (179,971) |  |  | 25.39 |  |  | — |  |  | — |
Outstanding as of December 31, 2019 | 1,715,000 |  |  | $ | 25.19 |  |  | 2,279,015 |  |  | $ | 20.62 |
Granted | 245,000 |  |  | 20.67 |  |  | 165,000 |  |  | 19.24 |
Expired or cancelled | (403,750) |  |  | 25.52 |  |  | (168,750) |  |  | 25.87 |
Vested/exercised | (521,250) |  |  | 29.44 |  |  | — |  |  | — |
Outstanding as of December 31, 2020 | 1,035,000 |  |  | $ | 21.85 |  |  | 2,275,265 |  |  | $ | 20.13 |
Summary Of Unrestricted Stock Units Issuance | The following table summarizes unrestricted stock units, which are generally issued to the non-employee members of the Company’s Board of Directors as part of their annual retainer fees:
| Unrestricted Stock Units
Year | Number |  | Weighted-Average Grant Date Fair Value Per Share
2018 | 115,420 |  |  | $ | 21.26 |
2019 | 98,591 |  |  | 15.72 |
2020 | 194,177 |  |  | 8.60 |
Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards | The fair value on the grant date and the significant assumptions used in the Black-Scholes option-pricing model are as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Total stock options granted | 165,000 |  |  | 220,000 |  |  | 664,000 |
Weighted-average grant date fair value | $ | 7.67 |  |  | $ | 7.59 |  |  | $ | 11.09 |
Weighted-average assumptions: |  |  |  |  |
Risk-free rate | 1.2 | % |  | 2.1 | % |  | 2.6 | %
Expected life of options(a) | 6.3 years |  | 6.1 years |  | 5.8 years
Expected volatility(b) | 60.7 | % |  | 39.4 | % |  | 42.2 | %
Expected quarterly dividends | $ | — |  |  | $ | — |  |  | $ | — |
_____________________________________________________________________________________________________________ (a)Calculated using the simplified method due to the terms of the stock options and the limited pool of grantees. (b)Calculated using historical volatility of the Company’s common stock over periods commensurate with the expected life of the option.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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