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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Share-based Compensation [Abstract]  
Summary Of Stock Option Activity
A summary of the Company's stock option activity for the nine months ended September 30, 2018 and September 30, 2017 is presented below:
Stock Options
Common
Shares
 
Weighted
Average
Strike Price
 
Remaining
Contractual
Term (1)
 
Intrinsic
Value (2)
($000)
Outstanding at January 1, 2018
1,084,756

 
$
41.98

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(271,674
)
 
41.36

 
 
 
 
Forfeited or canceled
(6,942
)
 
39.81

 
 
 
 
Outstanding at September 30, 2018
806,140

 
$
42.20

 
3.3
 
$
34,452

Exercisable at September 30, 2018
609,752

 
$
42.42

 
3.0
 
$
25,924


Stock Options
Common
Shares
 
Weighted
Average
Strike Price
 
Remaining
Contractual
Term (1)
 
Intrinsic
Value (2)
($000)
Outstanding at January 1, 2017
1,698,912

 
$
41.50

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(499,222
)
 
40.57

 
 
 
 
Forfeited or canceled
(16,378
)
 
43.07

 
 
 
 
Outstanding at September 30, 2017
1,183,312

 
$
41.87

 
4.2
 
$
43,122

Exercisable at September 30, 2017
640,759

 
$
41.58

 
3.5
 
$
23,532


(1)
Represents the remaining weighted average contractual life in years.
(2)
Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company's stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company's stock.
Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity
A summary of the Plans' restricted share activity for the nine months ended September 30, 2018 and September 30, 2017 is presented below:
 
Nine months ended September 30, 2018
 
Nine months ended September 30, 2017
Restricted Shares
Common
Shares

Weighted
Average
Grant-Date
Fair Value

Common
Shares

Weighted
Average
Grant-Date
Fair Value
Outstanding at January 1
127,787

 
$
53.33

 
133,425

 
$
49.94

Granted
28,506

 
87.65

 
14,249

 
72.53

Vested and issued
(10,438
)
 
56.88

 
(10,695
)
 
46.03

Forfeited or canceled
(982
)
 
55.39

 
(2,551
)
 
52.26

Outstanding at September 30
144,873

 
$
59.82

 
134,428

 
$
52.60

Vested, but not issuable at September 30
90,294

 
$
51.88

 
89,563

 
$
51.59


A summary of the Plans' performance-based stock award activity, based on the target level of the awards, for the nine months ended September 30, 2018 and September 30, 2017 is presented below:
 
Nine months ended September 30, 2018
 
Nine months ended September 30, 2017
Performance-based Stock
Common
Shares
 
Weighted
Average
Grant-Date
Fair Value
 
Common
Shares
 
Weighted
Average
Grant-Date
Fair Value
Outstanding at January 1
359,196

 
$
54.37

 
298,180

 
$
43.64

Granted
134,326

 
88.28

 
145,829

 
72.60

Vested and issued
(82,307
)
 
44.39

 
(68,712
)
 
46.85

Forfeited
(13,582
)
 
59.18

 
(14,164
)
 
52.81

Outstanding at September 30
397,633

 
$
67.72

 
361,133

 
$
54.36

Vested, but deferred at September 30
21,477

 
$
43.52

 
13,616

 
$
42.66