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Shareholders' Equity and Share-Based Compensation (Tables)
 12 Months Ended
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,
202020192018
CSUs related to deferred compensation for Directors23,609 28,526 32,288 
CSUs related to deferred compensation for employees20,467 25,194 24,498 
Stock options916,287 908,557 774,821 
RSUs related to incentive compensation823,393 889,438 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
OutstandingVested 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 OptionsVested and Exercisable Options
Range of
Option Prices
per Share		OptionsWeighted
Average
Option Price
per Share		Weighted
Average
Remaining
Term		OptionsWeighted
Average
Option Price
per Share		Weighted
Average
Remaining
Term
$28.88-$33.41
203,207 $30.844.61203,207 $30.844.61
$36.04-$41.95
546,108 $40.818.05154,902 $40.906.81
$42.73-$42.95
166,972 $42.937.3379,088 $42.947.26
Total916,287 $38.997.15437,197 $36.595.86
Summary of changes in outstanding restricted common stock units
Changes in outstanding RSUs were as follows:
Total Outstanding UnitsVested Units
UnitsWeighted Average
Grant Date Fair
Value per Unit		UnitsWeighted Average
Grant Date Fair
Value per Unit
December 31, 2019889,438 $31.94543,794 $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, 2020823,393 $33.88484,984 $27.48
(1)    Includes dividends reinvested into additional RSUs.
(2)    Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.