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Shareholders' Equity and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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,
202120202019
CSUs related to deferred compensation for Directors26,313 23,609 28,526 
CSUs related to deferred compensation for employees16,571 20,467 25,194 
Stock options1,032,128 916,287 908,557 
RSUs related to incentive compensation834,981 823,393 889,438 
Total
1,909,993 1,783,756 1,851,715 
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, 2020$38.99
$28.88-$42.95
916,287 437,197 
Granted
$40.10
$40.10-$40.10
183,272 — 
Vested
$41.27
$28.88-$42.95
— 163,519 
Exercised
$31.35
$31.01-$32.35
(8,015)(8,015)
Forfeited
$41.39
$41.10-$42.73
(49,411)— 
Expired
$42.23
$41.83-$42.73
(10,005)— 
December 31, 2021$39.10
$28.88-$42.95
1,032,128 592,701 
Summary of options outstanding segregated by ranges of exercise prices
Option information segregated by ranges of exercise prices were as follows:
December 31, 2021
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
195,192 $30.813.59195,192 $30.813.59
$36.04-$41.95
687,556 $40.617.52285,474 $40.846.35
$42.73-$42.73
149,380 $42.956.18112,035 $42.956.18
Total1,032,128 $39.106.58592,701 $37.945.41
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, 2020823,393 $33.88484,984 $27.48
Granted(1)
205,474 $41.29— —
Adjustment for performance achievement
14,272 $45.01— —
Vested
— —145,319 $42.15
Forfeited
(47,214)$43.08— —
Distributed(2)
(160,944)$38.43(160,944)—
December 31, 2021834,981 $34.50469,359 $28.27
(1)    Includes dividends reinvested into additional RSUs.
(2)    Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.