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Share-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Share-Based Compensation [Abstract] |
Summary of Restricted Stock Unit and Stock Option Activity |
| Restricted Stock Units |  | Stock Options
|  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average
|  |  | Grant Date |  |  |  | Exercise/
|  |  | Fair Value |  |  |  | (Strike) Price
| Number |  | Per Share |  | Number |  | Per Share
Outstanding as of December 31, 2016 | 1,156,484 |  | $ | 22.64 |  | 2,174,500 |  | $ | 19.50
Granted | 1,064,000 |  |  | 30.02 |  | 539,000 |  |  | 24.54
Expired or cancelled | (20,985) |  |  | 23.91 |  | (19,466) |  |  | 26.56
Vested/exercised | (801,515) |  |  | 19.38 |  | (140,000) |  |  | 21.41
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
Summary Of Unrestricted Stock Units Issuance |
|  |  | Unrestricted Stock Units |
|  |  |  |  | Weighted-Average |
|  |  |  |  | Grant Date |
| Year |  | Number |  | Fair Value Per Share |
| 2017 |  | 99,155 |  | $ | 26.26 |
| 2018 |  | 115,420 |  |  | 21.26 |
| 2019 |  | 98,591 |  |  | 15.72 |
Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards |
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Total stock options granted |  | 220,000 |  |  |  | 664,000 |  |  |  | 539,000 |
Weighted-average grant date fair value | $ | 7.59 |  |  | $ | 11.09 |  |  | $ | 13.11 |
Weighted-average assumptions: |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  | 2.1 | % |  |  | 2.6 | % |  |  | 1.8 | %
Expected life of options(a) |  | 6.1 |  |  |  | 5.8 |  |  |  | 4.8 |
Expected volatility(b) |  | 39.4 | % |  |  | 42.2 | % |  |  | 43.1 | %
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=116856206&loc=d3e5070-113901 + Details
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