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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-Based Compensation Expense Included in Consolidated Statement of Income and Comprehensive Income
Total stock-based compensation expense included in the Consolidated Statement of Income and Comprehensive Income was as follows: 
 
December 31,
(DOLLARS IN THOUSANDS)
2017
 
2016
 
2015
Equity-based awards
$
26,567

 
$
24,587

 
$
23,160

Liability-based awards
6,014

 
3,884

 
4,784

Total stock-based compensation
32,581

 
28,471

 
27,944

Less tax benefit
(5,659
)
 
(7,375
)
 
(8,348
)
Total stock-based compensation, net of tax
$
26,922

 
$
21,096

 
$
19,596
SSAR's and Stock Option Activity
SSARs and options activity was as follows: 
(SHARE AMOUNTS IN THOUSANDS)
Shares Subject to
SSARs/Options
 
Weighted
Average Exercise
Price
 
SSARs/
Options
Exercisable
December 31, 2016
19

 
$
59.14

 
18

Exercised
(15
)
 
57.66

 
 
Canceled
—

 
—

 
 
Balance at December 31, 2017
4

 
$
64.25

 
4
SSAR's and Stock Option Outstanding
SSARs and options outstanding at December 31, 2017 was as follows: 
Price Range
Number
Outstanding
(in thousands)
 
Weighted Average
Remaining
Contractual Life
(in years)
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic Value
(in thousands)
$51 – $60
4

 
1.34
 
$
60.39

 
 
Over $65
—

 
4.35
 
118.10

 
 
Total
4

 
 
 
$
64.25

 
$
376
SSAR's and Stock Option Exercisable
SSARs and options exercisable as of December 31, 2017 was as follows:
Price Range
Number
Exercisable
(in thousands)
 
Weighted Average
Remaining
Contractual Life
(in years)
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic Value
(in thousands)
$51 – $60
4

 
1.34
 
$
60.39

 
 
 
4

 
 
 
$
60.39

 
$
366
RSU's [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU, PRS and Cash RSU Activity
RSU activity was as follows: 
 
Number of Shares
(in thousands)
 
Weighted Average
Grant Date Fair
Value Per Share
December 31, 2016
444

 
$
107.43

Granted
161

 
131.36

Vested
(140
)
 
95.52

Forfeited
(24
)
 
115.79

Balance at December 31, 2017
441

 
$
119.45
PRS [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU, PRS and Cash RSU Activity
The following table summarizes the Company's activity for the years ended December 31, 2017, 2016 and 2015:
(DOLLARS IN MILLIONS)
Issued Shares
 
Aggregate Purchase Price
 
Covered Shares
 
PRSU
 
PRS
 
PRSU
 
PRS
 
 
2017
41,801

 
—

 
$
5.8

 
$
—

 
20,901

2016
58,629

 
—

 
7.0

 
—

 
29,315

2015
14,622

 
52,577

 
1.7

 
6.2

 
33,600

PRS and PRSU activity was as follows: 
(SHARE AMOUNTS IN THOUSANDS)
Number of
Shares
 
Weighted Average
Grant Date Fair
Value Per Share
December 31, 2016
198

 
$
110.62

Granted
42

 
138.83

Vested
(79
)
 
98.26

Forfeited
(2
)
 
118.95

Balance at December 31, 2017
159

 
$
124.15
Cash RSU's [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU, PRS and Cash RSU Activity
Cash RSU activity was as follows: 
(SHARE AMOUNTS IN THOUSANDS)
Cash RSUs
 
Weighted Average Fair
Value Per Share
December 31, 2016
96

 
$
117.83

Granted
32

 
152.61

Vested
(31
)
 
138.62

Forfeited
(2
)
 
132.80

Balance at December 31, 2017
95

 
$
152.61