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Stock Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value The weighted average grant-date fair value of performance awards granted under the Plan during 2020, 2019 and 2018 was as follows:
Years Ended December 31,
202020192018
Weighted average grant-date fair value$70.84 $61.01 $71.40 
Performance Award Transactions Performance award transactions during 2020 were as follows and are presented as if the Company were to achieve its maximum levels of performance under the plan:
Shares awarded but not earned at January 1932,182 
Shares awarded425,440 
Shares forfeited(221,586)
Shares earned(553,084)
Shares awarded but not earned at December 31582,952 
Restricted Stock Unit Award Transactions RSU transactions during the year ended December 31, 2020 were as follows:
Shares awarded but not vested at January 1396,529 
Shares awarded95,593 
Shares forfeited(67,914)
Shares vested(280,921)
Shares awarded but not vested at December 31143,287 
Weighted Average Grant-Date Fair Value Of SSARS And Assumptions Under Black-Scholes Option Model The weighted average grant-date fair value of SSAR awards granted under the Plan and the weighted average assumptions under the Black-Scholes option model were as follows for the years ended December 31, 2020, 2019 and 2018:
Years Ended December 31,
202020192018
Weighted average grant-date fair value$12.31 $11.34 $12.88 
Weighted average assumptions under Black-Scholes option model:
Expected life of awards (years)3.03.03.0
Risk-free interest rate1.5 %2.6 %2.2 %
Expected volatility24.1 %24.2 %23.7 %
Expected dividend yield0.9 %1.0 %0.8 %
SSAR Activity SSAR transactions during the year ended December 31, 2020 were as follows:
SSARs outstanding at January 1759,675 
SSARs granted187,100 
SSARs exercised(311,200)
SSARs canceled or forfeited(232,425)
SSARs outstanding at December 31403,150 
SSAR price ranges per share: 
Granted$72.74 
Exercised
43.88 - 73.14
Canceled or forfeited
43.88 - 73.14
Weighted average SSAR exercise prices per share: 
Granted$72.74 
Exercised56.61 
Canceled or forfeited67.87 
Outstanding at December 3166.44 
Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives The following table sets forth the exercise price range, number of shares, weighted average exercise price, and remaining contractual lives by groups of similar price as of December 31, 2020:
SSARs OutstandingSSARs Exercisable
Range of Exercise PricesNumber of
Shares		Weighted Average
Remaining
Contractual Life
(Years)		Weighted Average
Exercise Price		Exercisable as of December 31, 2020Weighted Average
Exercise Price
$43.88 - $62.85
142,106 3.73$60.52 68,756 $58.04 
$63.47 - $73.14
261,044 4.21$69.66 101,369 $67.56 
403,150 170,125 $63.71