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Stock Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [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 2018, 2017 and 2016 was as follows:
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Weighted average grant-date fair value
 
$
71.40

 
$
61.94

 
$
47.93
Performance Award Transactions
Performance award transactions during 2018 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
1,645,078

Shares awarded
441,740

Shares forfeited or unearned
(81,932
)
Shares earned and vested
(1,066,024
)
Shares awarded but not earned at December 31
938,862
Restricted Stock Unit Award Transactions
RSU transactions during the year ended December 31, 2018 were as follows:
Shares awarded but not vested at January 1
237,468

Shares awarded
247,404

Shares forfeited
(11,695
)
Shares vested
(120,202
)
Shares awarded but not vested at December 31
352,975
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, 2018, 2017 and 2016:
 
Years Ended December 31,
 
2018
 
2017
 
2016
Weighted average grant-date fair value
$
12.88

 
$
11.45

 
$
7.98

Weighted average assumptions under Black-Scholes option model:
 

 
 

 
 

Expected life of awards (years)
3.0

 
3.0

 
3.0

Risk-free interest rate
2.2
%
 
1.5
%
 
1.1
%
Expected volatility
23.7
%
 
25.9
%
 
25.9
%
Expected dividend yield
0.8
%
 
0.9
%
 
1.1
%
SSAR Activity
SSAR transactions during the year ended December 31, 2018 were as follows:
SSARs outstanding at January 1
 
1,060,192

SSARs granted
 
157,700

SSARs exercised
 
(109,950
)
SSARs canceled or forfeited
 
(8,350
)
SSARs outstanding at December 31
 
1,099,592

SSAR price ranges per share:
 
 

Granted
$
73.14

Exercised
 
43.39 - 63.47

Canceled or forfeited
 
43.88 - 63.47

Weighted average SSAR exercise prices per share:
 
 

Granted
$
73.14

Exercised
 
51.01

Canceled or forfeited
 
53.68

Outstanding at December 31
 
55.58
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, 2018:
 
 
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, 2018
 
Weighted Average
Exercise Price
$43.88-$52.85
 
528,600

 
3.3
 
$
45.90

 
318,675

 
$
46.06

$55.07-$73.14
 
570,992

 
4.6
 
$
64.54

 
202,192

 
$
58.88

 
 
1,099,592

 
 
 
 
 
520,867

 
$
51.03