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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | A summary of the stock option activity is presented below (in thousands, except per share amounts):
|  | Options Outstanding |
|  | Number of Shares Subject to Options |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value |
Balance at December 31, 2017 |  |  | 1,172 |  |  | $ | 24.06 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (427 | ) |  | $ | 18.75 |  |  |  |  |  |  |  |  |
Options canceled / forfeited / expired |  |  | (67 | ) |  | $ | 34.43 |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  |  | 678 |  |  | $ | 26.39 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (42 | ) |  | $ | 16.66 |  |  |  |  |  |  |  |  |
Options canceled / forfeited / expired |  |  | (31 | ) |  | $ | 33.61 |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  | 605 |  |  | $ | 26.68 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Options assumed |  |  | 175 |  |  | $ | 50.96 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (7 | ) |  | $ | 13.47 |  |  |  |  |  |  |  |  |
Options canceled / forfeited / expired |  |  | (136 | ) |  | $ | 44.59 |  |  |  |  |  |  |  |  |
Balance at December 31, 2020 |  |  | 637 |  |  | $ | 29.59 |  |  |  | 2.67 |  |  | $ | 458 |
Vested and expected to vest at December 31, 2020 |  |  | 636 |  |  |  |  |  |  |  | 2.66 |  |  | $ | 458 |
Exercisable at December 31, 2020 |  |  | 620 |  |  |  |  |  |  |  | 2.56 |  |  | $ | 458 |
Summary of Stock Options Outstanding and Exercisable | The following table summarizes information about stock options outstanding and exercisable under all of the Company’s plans at December 31, 2020:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices per Share |  | Number Outstanding (in thousands) |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price per Share |  |  | Number Exercisable (in thousands) |  |  | Weighted Average Exercise Price per Share |
$12.52 - $19.24 |  |  | 113 |  |  |  | 2.63 |  |  | $ | 18.06 |  |  |  | 113 |  |  | $ | 18.06 |
$19.34 - $19.73 |  |  | 79 |  |  |  | 2.56 |  |  | $ | 19.53 |  |  |  | 79 |  |  | $ | 19.53 |
$20.21 - $21.30 |  |  | 82 |  |  |  | 2.84 |  |  | $ | 20.68 |  |  |  | 82 |  |  | $ | 20.67 |
$22.19 - $22.24 |  |  | 15 |  |  |  | 3.30 |  |  | $ | 22.19 |  |  |  | 15 |  |  | $ | 22.19 |
$22.45 - $22.45 |  |  | 70 |  |  |  | 6.79 |  |  | $ | 22.45 |  |  |  | 53 |  |  | $ | 22.45 |
$22.52 - $38.65 |  |  | 96 |  |  |  | 3.83 |  |  | $ | 32.48 |  |  |  | 96 |  |  | $ | 32.48 |
$43.54 - $43.63 |  |  | 6 |  |  |  | 0.57 |  |  | $ | 43.56 |  |  |  | 6 |  |  | $ | 43.56 |
$43.77 - $43.77 |  |  | 108 |  |  |  | 0.13 |  |  | $ | 43.77 |  |  |  | 108 |  |  | $ | 43.77 |
$45.90 - $54.60 |  |  | 45 |  |  |  | 0.73 |  |  | $ | 51.35 |  |  |  | 45 |  |  | $ | 51.35 |
$54.69 - $54.69 |  |  | 23 |  |  |  | 1.16 |  |  | $ | 54.69 |  |  |  | 23 |  |  | $ | 54.69 |
$12.52 - $54.69 |  |  | 637 |  |  |  | 2.67 |  |  | $ | 29.59 |  |  |  | 620 |  |  | $ | 29.80 |
Summary of Restricted Stock Awards and Units | Information with respect to outstanding restricted stock awards and units as of December 31, 2020 is as follows (in thousands, except per share amounts):
|  | Restricted Stock and Restricted Stock Units |
|  | Number of Shares Subject to Time- based Vesting |  |  | Number of Shares Subject to Performance- based Vesting |  |  | Total Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Balance at December 31, 2017 |  |  | 2,014 |  |  |  | 1,119 |  |  |  | 3,133 |  |  | $ | 33.35 |
Awards and units granted |  |  | 1,087 |  |  |  | 44 |  |  |  | 1,131 |  |  | $ | 21.85 |
Awards and units vested / earned |  |  | (695 | ) |  |  | (176 | ) |  |  | (871 | ) |  | $ | 34.84 |
Awards and units canceled / forfeited |  |  | (257 | ) |  |  | (230 | ) |  |  | (487 | ) |  | $ | 29.35 |
Balance at December 31, 2018 |  |  | 2,149 |  |  |  | 757 |  |  |  | 2,906 |  |  | $ | 29.10 |
Awards and units granted |  |  | 1,266 |  |  |  | 4 |  |  |  | 1,270 |  |  | $ | 22.79 |
Awards and units vested / earned |  |  | (865 | ) |  |  | (118 | ) |  |  | (983 | ) |  | $ | 30.62 |
Awards and units canceled / forfeited |  |  | (179 | ) |  |  | (89 | ) |  |  | (268 | ) |  | $ | 27.53 |
Balance at December 31, 2019 |  |  | 2,371 |  |  |  | 554 |  |  |  | 2,925 |  |  | $ | 25.99 |
Awards and units granted |  |  | 3,331 |  |  |  | 994 |  |  |  | 4,325 |  |  | $ | 14.64 |
Awards and units assumed |  |  | 2,185 |  |  |  | 253 |  |  |  | 2,438 |  |  | $ | 13.99 |
Awards converted |  |  | 11 |  |  |  | (11 | ) |  |  | — |  |  | $ | 22.45 |
Awards and units vested / earned |  |  | (1,676 | ) |  |  | (487 | ) |  |  | (2,163 | ) |  | $ | 21.12 |
Awards and units canceled / forfeited |  |  | (560 | ) |  |  | (242 | ) |  |  | (802 | ) |  | $ | 19.96 |
Balance at December 31, 2020 |  |  | 5,662 |  |  |  | 1,061 |  |  |  | 6,723 |  |  | $ | 16.63 |

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