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Shareholders' Equity and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of stock units and stock options outstanding under the comprehensive Plan | As further described in the paragraphs below, CSUs, stock options and RSUs under the Comprehensive Plan were as follows:
|  | December 31,
|  | 2020 |  | 2019 |  | 2018
CSUs related to deferred compensation for Directors |  | 23,609 |  |  | 28,526 |  |  | 32,288 |
CSUs related to deferred compensation for employees |  | 20,467 |  |  | 25,194 |  |  | 24,498 |
Stock options |  | 916,287 |  |  | 908,557 |  |  | 774,821 |
RSUs related to incentive compensation |  | 823,393 |  |  | 889,438 |  |  | 1,008,249 |
Total |  | 1,783,756 |  |  | 1,851,715 |  |  | 1,839,856 |
Summary of changes in outstanding options | Changes in outstanding options were as follows:
|  | Weighted Average Option Price per Share |  | Range of Option Prices per Share |  | Options
|  |  |  | Outstanding |  | Vested and Exercisable
December 31, 2019 |  | $37.82 |  | $20.60-$44.75 |  | 908,557 |  |  | 368,700 |
Granted |  | $41.83 |  | $41.83-$41.83 |  | 234,248 |  |  | — |
Vested |  | $38.59 |  | $28.88-$42.95 |  | — |  |  | 145,788 |
Exercised |  | $31.08 |  | $20.60-$42.95 |  | (77,291) |  |  | (77,291) |
Forfeited |  | $40.64 |  | $31.01-$42.95 |  | (106,362) |  |  | — |
Expired |  | $39.99 |  | $20.60-$42.95 |  | (42,865) |  |  | — |
December 31, 2020 |  | $38.99 |  | $28.88-$42.95 |  | 916,287 |  |  | 437,197 |
Summary of options outstanding segregated by ranges of exercise prices | Option information segregated by ranges of exercise prices were as follows:
|  | December 31, 2020
|  |  |  | Total Outstanding Options |  | Vested and Exercisable Options
|  | Range of Option Prices per Share |  | Options |  | Weighted Average Option Price per Share |  | Weighted Average Remaining Term |  | Options |  | Weighted Average Option Price per Share |  | Weighted Average Remaining Term
|  | $28.88-$33.41 |  | 203,207 |  |  | $30.84 |  | 4.61 |  | 203,207 |  |  | $30.84 |  | 4.61
|  | $36.04-$41.95 |  | 546,108 |  |  | $40.81 |  | 8.05 |  | 154,902 |  |  | $40.90 |  | 6.81
|  | $42.73-$42.95 |  | 166,972 |  |  | $42.93 |  | 7.33 |  | 79,088 |  |  | $42.94 |  | 7.26
Total |  |  |  | 916,287 |  |  | $38.99 |  | 7.15 |  | 437,197 |  |  | $36.59 |  | 5.86
Summary of changes in outstanding restricted common stock units | Changes in outstanding RSUs were as follows:
|  | Total Outstanding Units |  | Vested Units
|  | Units |  | Weighted Average Grant Date Fair Value per Unit |  | Units |  | Weighted Average Grant Date Fair Value per Unit
December 31, 2019 |  | 889,438 |  |  | $31.94 |  | 543,794 |  |  | $24.77
Granted (1) |  | 197,207 |  |  | $42.07 |  | — |  |  | —
Adjustment for performance achievement |  | 419 |  |  | $46.32 |  | — |  |  | —
Vested |  | — |  |  | — |  | 143,836 |  |  | $42.56
Forfeited |  | (61,025) |  |  | $43.60 |  | — |  |  | —
Distributed (2) |  | (202,646) |  |  | $34.51 |  | (202,646) |  |  | $34.51
December 31, 2020 |  | 823,393 |  |  | $33.88 |  | 484,984 |  |  | $27.48
(1) Includes dividends reinvested into additional RSUs. (2) Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.

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