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Share-Based Compensation And Share Repurchase Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-Based Compensation And Share Repurchase Plans [Abstract] |
Schedule Of Fair Value Of Options, Weighted Average Assumptions |
|  | 2020 |  | 2019 |  | 2018
Stock option exercise price |  | $ | 4.66 |  | $ | 16.12 |  | $ | 16.40
Risk-free interest rate |  |  | 0.25% |  |  | 2.42% |  |  | 2.56%
Expected dividend yield |  |  | — |  |  | — |  |  | —
Expected option life in years |  |  | 3.75 |  |  | 3.75 |  |  | 3.75
Expected volatility |  |  | 51.83% |  |  | 23.32% |  |  | 24.99%
Weighted average fair value |  | $ | 1.80 |  | $ | 3.50 |  | $ | 3.80
Schedule Of Stock Options Outstanding And Exercisable |
|  | Outstanding Stock Options
|  | Number of ‎Options |  | Weighted Average ‎Exercise Price |  | Weighted Average ‎Remaining Years of ‎Contractual Life |  | Aggregate ‎Intrinsic ‎Value
|  | Class A |  | Class B |  | Class A |  | Class B |  | Class A&B |  | Class A&B
Outstanding - January 1, 2018 |  | 524,589 |  | — |  | $ | 12.50 |  | $ | — |  | 3.15 |  | $ | 3,054,325
Granted |  | 126,840 |  | — |  |  | 16.40 |  |  | — |  |  |  |  |
Exercised |  | (60,000) |  | — |  |  | 6.02 |  |  | — |  |  |  |  | 610,249
Expired |  | (4,960) |  | — |  |  | 12.08 |  |  | — |  |  |  |  |
Outstanding - December 31, 2018 |  | 586,469 |  | — |  | $ | 14.01 |  | $ | — |  | 2.88 |  | $ | 1,530,528
Granted |  | 219,408 |  | — |  |  | 16.12 |  |  | — |  |  |  |  |
Exercised |  | (69,500) |  | — |  |  | 13.42 |  |  | — |  |  |  |  | 185,175
Expired |  | (25,000) |  | — |  |  | 13.42 |  |  | — |  |  |  |  |
Outstanding - December 31, 2019 |  | 711,377 |  | — |  | $ | 14.74 |  | $ | — |  | 2.79 |  | $ | 136,350
Granted |  | 38,803 |  | — |  |  | 4.66 |  |  | — |  |  |  |  |
Exercised |  | — |  | — |  |  | — |  |  | — |  |  |  |  | —
Expired |  | (36,701) |  | — |  |  | 14.74 |  |  | — |  |  |  |  |
Outstanding - December 31, 2020 |  | 713,479 |  | — |  | $ | 14.64 |  | $ | — |  | 2.18 |  | $ | 13,969
Summary Of Stock Options Vested And Unvested |
|  | Vested and Unvested Stock Options
|  | Number of ‎Options |  | Weighted Average ‎Exercise Price |  | Weighted Average ‎Remaining Years of ‎Contractual Life |  | Aggregate ‎Intrinsic ‎Value
|  | Class A |  | Class B |  | Class A |  |  | Class B |  | Class A&B |  | Class A&B
Vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  | 418,435 |  | — |  | $ | 13.87 |  | $ | — |  | 1.64 |  | $ | —
December 31, 2019 |  | 273,866 |  | — |  |  | 12.59 |  |  | — |  | 1.87 |  |  | 136,350
December 31, 2018 |  | 231,124 |  | — |  |  | 12.38 |  |  | — |  | 2.28 |  |  | 1,306,643
Unvested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  | 295,044 |  | — |  | $ | 15.77 |  | $ | — |  | 2.47 |  | $ | 13,969
December 31, 2019 |  | 437,511 |  | — |  |  | 15.78 |  |  | — |  | 3.36 |  |  | —
December 31, 2018 |  | 355,345 |  | — |  |  | 15.07 |  |  | — |  | 3.27 |  |  | 223,885
Schedule Of Restricted Stock Units Issued And Vested |
|  | Number of RSUs |  |  | $ value of RSUs
|  | Granted |  | Vesting |  | Forfeited |  | Unvested |  | Granted |  | Vesting |  |  | Forfeited |  | Unvested
2016 |  | 68,153 |  | 67,372 |  | 781 |  | — |  | $ | 815,160 |  | $ | 805,760 |  | $ | 9,400 |  | $ | —
2017 |  | 70,538 |  | 61,590 |  | 532 |  | 8,416 |  |  | 1,124,348 |  |  | 981,448 |  |  | 8,496 |  |  | 134,404
2018 |  | 97,600 |  | 74,292 |  | 2,102 |  | 21,206 |  |  | 1,581,512 |  |  | 1,199,232 |  |  | 34,240 |  |  | 348,040
2019 |  | 59,258 |  | 22,713 |  | 3,104 |  | 33,441 |  |  | 944,070 |  |  | 354,806 |  |  | 50,005 |  |  | 539,259
2020 |  | 401,966 |  | — |  | 818 |  | 401,148 |  |  | 1,756,002 |  |  | — |  |  | 5,002 |  |  | 1,751,000
Total |  | 697,515 |  | 225,967 |  | 7,337 |  | 464,211 |  | $ | 6,221,091 |  | $ | 3,341,245 |  | $ | 107,144 |  | $ | 2,772,703

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