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Stock Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2019
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 2019, 2018 and 2017 was as follows:
 
 
Years Ended December 31,
 
 
2019
 
2018
 
2017
Weighted average grant-date fair value
 
$
61.01

 
$
71.40

 
$
61.94
Performance Award Transactions
Performance award transactions during 2019 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 1
938,862

Shares awarded
542,180

Shares forfeited
(45,346
)
Shares earned
(503,514
)
Shares awarded but not earned at December 31
932,182
Restricted Stock Unit Award Transactions RSU transactions during the year ended December 31, 2019 were as follows:
Shares awarded but not vested at January 1
352,975

Shares awarded
165,160

Shares forfeited
(8,424
)
Shares vested
(113,182
)
Shares awarded but not vested at December 31
396,529
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, 2019, 2018 and 2017:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Weighted average grant-date fair value
$
11.34

 
$
12.88

 
$
11.45

Weighted average assumptions under Black-Scholes option model:
 
 
 
 
 
Expected life of awards (years)
3.0

 
3.0

 
3.0

Risk-free interest rate
2.6
%
 
2.2
%
 
1.5
%
Expected volatility
24.2
%
 
23.7
%
 
25.9
%
Expected dividend yield
1.0
%
 
0.8
%
 
0.9
%
SSAR Activity

SSAR transactions during the year ended December 31, 2019 were as follows:
SSARs outstanding at January 1
1,099,592

SSARs granted
243,600

SSARs exercised
(562,030
)
SSARs canceled or forfeited
(21,487
)
SSARs outstanding at December 31
759,675

SSAR price ranges per share:
 

Granted
$
62.85

Exercised
43.88 - 73.14

Canceled or forfeited
43.88 - 73.14

Weighted average SSAR exercise prices per share:
 

Granted
$
62.85

Exercised
50.73

Canceled or forfeited
62.56

Outstanding at December 31
61.30
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, 2019:
 
 
SSARs Outstanding
 
SSARs Exercisable
Range of Exercise Prices
 
Number of
Shares
 
Weighted Average
Remaining
Contractual Life
(Years)
 
Weighted Average
Exercise Price
 
Exercisable as of December 31, 2019
 
Weighted Average
Exercise Price
$43.88 - $55.23
 
175,825

 
2.6
 
$
46.52

 
111,100

 
$
46.45

$62.85 - $ 73.14
 
583,850

 
5.1
 
$
65.75

 
98,525

 
$
67.09

 
 
759,675

 
 
 
 
 
209,625

 
$
56.15