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Shareholders' Equity and Common Stock Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
|  | 2018 |  | 2017 |  | 2016
CSUs related to deferred compensation for Directors |  | 32,288 |  |  | 61,677 |  |  | 74,058 |
CSUs related to deferred compensation for employees |  | 24,498 |  |  | 24,903 |  |  | 51,502 |
Stock options |  | 774,821 |  |  | 719,015 |  |  | 747,032 |
RSUs related to incentive compensation |  | 1,008,249 |  |  | 1,149,679 |  |  | 1,419,268 |
Total |  | 1,839,856 |  |  | 1,955,274 |  |  | 2,291,860 |
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, 2017 |  | $32.80 |  | $17.01-$41.95 |  | 719,015 |  |  | 258,321 |
Granted |  | $43.04 |  | $42.95-$44.75 |  | 223,208 |  |  | — |
Vested |  | $31.42 |  | $17.32-$41.95 |  | — |  |  | 158,233 |
Exercised |  | $27.07 |  | $17.01-$41.95 |  | (145,438 | ) |  | (145,438 | )
Forfeited |  | $39.07 |  | $31.01-$42.95 |  | (21,964 | ) |  | — |
Expired |  | — |  | — |  | — |  |  | — |
December 31, 2018 |  | $36.65 |  | $17.32-$44.75 |  | 774,821 |  |  | 271,116 |
Summary of options outstanding segregated by ranges of exercise prices | Option information segregated by ranges of exercise prices was as follows:
|  | December 31, 2018
|  |  |  | 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
|  | $17.01-$22.69 |  | 36,524 |  |  | $19.77 |  | 0.82 |  | 36,524 |  |  | $19.77 |  | 0.82 years
|  | $28.88-$33.41 |  | 320,897 |  |  | $31.01 |  | 6.68 |  | 183,685 |  |  | $30.85 |  | 6.40 years
|  | $38.05-$41.95 |  | 199,452 |  |  | $41.82 |  | 8.19 |  | 50,907 |  |  | $41.82 |  | 8.19 years
|  | $41.95-$44.75 |  | 217,948 |  |  | $43.05 |  | 9.19 |  | — |  |  | — |  | 0 years
Total |  |  |  | 774,821 |  |  | $36.65 |  | 7.50 |  | 271,116 |  |  | $31.42 |  | 5.98 years
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, 2017 |  | 1,149,679 |  |  | $32.05 |  | 558,139 |  |  | $19.80
Granted (1) |  | 188,675 |  |  | $42.21 |  | — |  |  | —
Vested |  | — |  |  | — |  | 144,290 |  |  | $31.58
Forfeited |  | (44,855 | ) |  | $38.08 |  | — |  |  | —
Distributed (2) |  | (285,250 | ) |  | $25.15 |  | (285,250 | ) |  | $25.15
December 31, 2018 |  | 1,008,249 |  |  | $35.64 |  | 417,179 |  |  | $20.22
____________________
(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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