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Stock Based and Other Management Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stock Options, Valuation Assumptions | The weighted average assumptions used in our Black-Scholes option pricing model for options granted in 2021, 2020 and 2019 were as follows:
|  | 2021 | 2020 |  | 2019
Dividend yield |  | 0.32% - 0.35% | 0.44% - 3.77% |  | 2.39% - 3.05%
Expected volatility |  | 62 | % | 50 | % |  | 50 | %
Risk-free interest rate |  | 1.1% - 1.21% | 0.37% - 1.22% |  | 1.79% - 2.63%
Expected term in years |  | 6.5 years | 6.5 years |  | 6.5 years
Stock Options, Activity | The following table summarizes activity related to stock options during 2021:
|  | Number of Options |  | Weighted- Average Exercise Price Per Share |  | Aggregate Intrinsic Value (thousands) |  | Weighted Average Remaining Term (Years)
Outstanding at December 31, 2020 |  | 1,248,935 |  |  | $ | 13.66 |  |  |  |  |
Granted |  | 479,500 |  |  | $ | 11.49 |  |  |  |  |
Exercised |  | (39,700) |  |  | $ | 10.67 |  |  |  |  |
Forfeited or expired |  | (72,015) |  |  | $ | 14.02 |  |  |  |  |
Outstanding at December 31, 2021 |  | 1,616,720 |  |  | $ | 13.08 |  |  | $ | 972,123 |  |  | 7.6 years
Vested and Expected to vest as of December 31, 2021 |  | 1,616,720 |  |  | $ | 13.08 |  |  | $ | 972,123 |  |  | 7.6 years
Exercisable at December 31, 2021 |  | 1,500,800 |  |  | $ | 12.79 |  |  | $ | 972,123 |  |  | 7.6 years
A summary of the status and changes of stock options and the related average price per share follows:
|  | Number of Options |  | Weighted- Average Grant Date Fair Value
Outstanding unvested as of December 31, 2020 |  | 906,361 |  |  | $ | 4.94 |
Granted |  | 479,500 |  |  | 6.50 |
Vested |  | (1,227,592) |  |  | 5.38 |
Forfeited |  | (42,349) |  |  | 5.09 |
Outstanding unvested as of December 31, 2021 |  | 115,920 |  |  | $ | 6.64 |
Schedule of Nonvested Restricted Stock Units Activity | A summary of the status and changes of shares subject to RSU awards for employees and the related average price per share follows:
|  | Number of Shares |  | Weighted- Average Grant Date Fair Value
Outstanding unvested as of December 31, 2020 |  | 502,770 |  |  | $ | 10.28 |
Granted |  | 515,960 |  |  | 11.49 |
Cancelled |  | (16,795) |  |  | 10.78 |
Vested |  | (999,239) |  |  | 10.88 |
Outstanding unvested as of December 31, 2021 |  | 2,696 |  |  | $ | 13.96 |

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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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