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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of Information with Respect to Outstanding and Exercisable Stock Options | The following table summarizes information with respect to all outstanding and exercisable stock options under all of our plans as of December 31, 2020:
|  |  |  |  |  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number of Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in Years) |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$ | 2.82 |  |  | $ | 3.93 |  |  |  | 170,656 |  |  | $ | 3.51 |  |  |  | 3.62 |  |  |  | 170,656 |  |  | $ | 3.51 |
$ | 4.07 |  |  | $ | 4.49 |  |  |  | 142,764 |  |  | $ | 4.32 |  |  |  | 5.05 |  |  |  | 142,764 |  |  | $ | 4.32 |
$ | 5.00 |  |  | $ | 5.96 |  |  |  | 179,199 |  |  | $ | 5.82 |  |  |  | 4.47 |  |  |  | 179,199 |  |  | $ | 5.82 |
$ | 6.51 |  |  | $ | 8.30 |  |  |  | 198,556 |  |  | $ | 7.65 |  |  |  | 4.49 |  |  |  | 139,466 |  |  | $ | 7.37 |
$ | 9.69 |  |  | $ | 13.15 |  |  |  | 72,794 |  |  | $ | 9.94 |  |  |  | 6.42 |  |  |  | 72,794 |  |  | $ | 9.94 |
$ | 13.80 |  |  | $ | 13.80 |  |  |  | 236,452 |  |  | $ | 13.80 |  |  |  | 7.18 |  |  |  | 105,670 |  |  | $ | 13.80 |
$ | 15.39 |  |  | $ | 15.39 |  |  |  | 56,119 |  |  | $ | 15.39 |  |  |  | 7.41 |  |  |  | 56,119 |  |  | $ | 15.39 |
$ | 21.29 |  |  | $ | 21.29 |  |  |  | 41,958 |  |  | $ | 21.29 |  |  |  | 8.61 |  |  |  | 41,958 |  |  | $ | 21.29 |
$ | 21.80 |  |  | $ | 21.80 |  |  |  | 48,576 |  |  | $ | 21.80 |  |  |  | 0.20 |  |  |  | 48,576 |  |  | $ | 21.80 |
$ | 22.13 |  |  | $ | 22.13 |  |  |  | 80,000 |  |  | $ | 22.13 |  |  |  | 0.38 |  |  |  | 80,000 |  |  | $ | 22.13 |
|  |  |  |  |  |  |  |  | 1,227,074 |  |  | $ | 10.07 |  |  |  | 4.90 |  |  |  | 1,037,202 |  |  | $ | 9.70 |
Schedule of Deferred Stock Units to be Settled in Shares | The following table summarizes information with respect to all deferred stock units during the years ended December 31, 2020, 2019 and 2018:
|  | Deferred Stock Units to be Settled in Shares |  |  | Weighted Average Grant-Date Fair Value Per Unit |
Outstanding as of December 31, 2017 (1) |  |  | 76,023 |  |  | $ | 4.44 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Outstanding as of December 31, 2018 (1) |  |  | 76,023 |  |  | $ | 4.44 |
Granted |  |  | - |  |  |  | - |
Vested (2) |  |  | (2,928 | ) |  |  | 5.56 |
Forfeited |  |  | - |  |  |  | - |
Outstanding as of December 31, 2019 (1) |  |  | 73,095 |  |  | $ | 4.39 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Outstanding as of December 31, 2020 (1) |  |  | 73,095 |  |  | $ | 4.39 |
| (1) | Includes vested but unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement.
| (2) | Includes previously vested awards which were released during the period.
Schedule of Restricted Stock Units to be Settled in Cash | The following table summarizes information with respect to all cash-settled restricted stock units for the years ended December 31, 2020, 2019 and 2018:
|  | Restricted Stock Units to be Settled in Cash |
Outstanding as of December 31, 2017 |  |  | 471,728 |
Granted |  |  | - |
Vested |  |  | (214,192 | )
Forfeited |  |  | (44,742 | )
Outstanding as of December 31, 2018 |  |  | 212,794 |
Granted |  |  | - |
Vested |  |  | (129,116 | )
Forfeited |  |  | (2,170 | )
Outstanding as of December 31, 2019 |  |  | 81,508 |
Granted |  |  | - |
Vested |  |  | (81,508 | )
Forfeited |  |  | - |
Outstanding as of December 31, 2020 |  |  | - |
Summary of Total Stock Based Compensation Expense | Stock-Based Compensation Expense. Total stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 for all types of awards was as follows (dollars in thousands):
|  | December 31, |
Award Type |  | 2020 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 1,134 |  |  | $ | 1,690 |  |  | $ | 1,956 |
Restricted stock units settled in stock |  |  | 12,227 |  |  |  | 7,569 |  |  |  | 3,641 |
Restricted stock units settled in cash |  |  | (240 | ) |  |  | 2,301 |  |  |  | 2,197 |
Total stock-based compensation expense |  | $ | 13,121 |  |  | $ | 11,560 |  |  | $ | 7,794 |
Schedule of Fair Value of Stock Option Award Granted Estimated on Date of Grant Using the Black-Scholes-Merton Option Pricing Model | The weighted average fair value per share of stock option awards granted during the years ended December 31, 2019 and 2018, and assumptions used to value stock options are as follows:
|  | For the Year Ended December 31, |
|  | 2020 (1) |  | 2019 |  |  | 2018 |
Dividend yield |  | NA |  |  | - |  |  |  | - |
Risk-free interest rate |  | NA |  |  | 1.6 | % |  |  | 2.6 | %
Weighted average volatility |  | NA |  |  | 62.6 | % |  |  | 56.1 | %
Expected life (in years) |  | NA |  |  | 8.0 |  |  |  | 5.0 |
Weighted average grant date fair value per share of options granted |  | NA |  | $ | 13.78 |  |  | $ | 7.09 |
| (1) | There were no stock options awarded during the year ended December 31, 2020.
Restricted Stock Units [Member] |
Schedule of Information with Respect to all Outstanding Restricted Stock | The following table summarizes information with respect to all outstanding restricted stock units to be settled in shares of stock under our plans during the years ended December 31, 2020, 2019 and 2018:
|  | Restricted Stock to be Settled in Shares of Stock |
|  | Units |  |  | Weighted Average Grant-Date Fair Value Per Unit |
Outstanding as of December 31, 2017 |  |  | 1,453,823 |  |  | $ | 5.32 |
Granted |  |  | 1,397,644 |  |  |  | 12.91 |
Vested |  |  | (709,132 | ) |  |  | 4.97 |
Forfeited |  |  | (124,858 | ) |  |  | 7.14 |
Outstanding as of December 31, 2018 (1) |  |  | 2,017,477 |  |  | $ | 12.70 |
Granted |  |  | 427,488 |  |  |  | 21.31 |
Vested |  |  | (500,818 | ) |  |  | 6.14 |
Forfeited |  |  | (22,955 | ) |  |  | 11.42 |
Outstanding as of December 31, 2019 |  |  | 1,921,192 |  |  | $ | 16.34 |
Granted |  |  | 534,471 |  |  |  | 15.45 |
Vested |  |  | (242,515 | ) |  |  | 11.02 |
Forfeited |  |  | (67,098 | ) |  |  | 17.18 |
Outstanding as of December 31, 2020 |  |  | 2,146,050 |  |  | $ | 16.70 |
| (1) | The weighted average grant-date fair value per unit as of December 31, 2018 reflects an adjusted fair value per unit from $10.59 to $12.70 due to the modification of grants approved by the Board of Directors during 2019 for our performance-based awards granted on December 14, 2018.
Employee Stock Option [Member] |
Summary of Stock Option Activity | Stock option activity during the years ended December 31, 2020, 2019 and 2018 under our plans was as follows:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding as of December 31, 2017 |  |  | 2,868,053 |  |  | $ | 9.86 |  |  |  |  |  |  |  |  |
Granted |  |  | 336,768 |  |  |  | 14.10 |  |  |  |  |  |  |  |  |
Exercised |  |  | (161,072 | ) |  |  | 8.46 |  |  |  |  |  |  | $ | 987 |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Cancelled |  |  | (225,316 | ) |  |  | 20.58 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 2,818,433 |  |  | $ | 9.59 |  |  |  |  |  |  |  |  |
Granted |  |  | 41,958 |  |  |  | 21.29 |  |  |  |  |  |  |  |  |
Exercised |  |  | (258,621 | ) |  |  | 5.76 |  |  |  |  |  |  | $ | 2,902 |
Forfeited |  |  | (8,017 | ) |  |  | 15.39 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (156,144 | ) |  |  | 22.99 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2019 |  |  | 2,437,609 |  |  | $ | 9.32 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,040,304 | ) |  |  | 5.18 |  |  |  |  |  |  | $ | 7,615 |
Forfeited |  |  | (8,719 | ) |  |  | 11.79 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (161,512 | ) |  |  | 30.25 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2020 |  |  | 1,227,074 |  |  | $ | 10.07 |  |  |  | 4.90 |  |  | $ | 5,150 |
Exercisable as of December 31, 2020 |  |  | 1,037,202 |  |  | $ | 9.70 |  |  |  | 4.54 |  |  | $ | 4,894 |

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