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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of compensation expense and the related income tax benefit recognized for all share-based awards
For the years ended December 31, 2017, 2016, and 2015, compensation expense and the related income tax benefit recognized for stock options and restricted stock were as follows:
(dollars in thousands)
 
2017

 
 
2016

 
 
2015

Compensation Expense
 
$
7,369

 
 
$
6,787

 
 
$
7,689

Income Tax Benefit
 
2,910

 
 
2,680

 
 
3,036
Schedule of activity for restricted stock
The following table presents the activity for restricted stock:
 
Number of Shares

Weighted Average
Grant Date Fair Value
 
Grant Date Fair Value
of Restricted Stock that
Vested During the Year
(in thousands)
 
Unvested as of December 31, 2014
263,446

 
$
53.04

 
 
Granted
116,331

 
57.31

 
 
Vested
(108,949
)
 
52.47

 
$
5,759

Forfeited
(2,015
)
 
54.17

 
 
Unvested as of December 31, 2015
268,813

 
$
55.92

 
 
Granted
121,495

 
64.40

 
 
Vested
(105,891
)
 
53.46

 
$
5,661

Forfeited
(13,894
)
 
58.14

 
 
Unvested as of December 31, 2016
270,523

 
$
60.58

 
 
Granted
124,460

 
84.53

 
 
Vested
(52,822
)
 
60.06

 
$
4,493

Forfeited
(22,058
)
 
69.46

 
 
Unvested as of December 31, 2017 1
320,103

 
$
69.36

 
 
Schedule of activity for restricted stock units
The following table presents the activity for RSU:
 
Number of Units

 
Weighted Average
Grant Date Fair Value
 
Fair Value of Restricted
Stock Unit that Vested During the Year
(in thousands)
 
Balance as of December 31, 2014
105,405

 
 
$
55.17

 
 
Granted
61,751

 
 
56.68

 
 
Vested
(31,651
)
 
 
55.17

 
$
1,940

Balance as of December 31, 2015
135,505

 
 
$
55.86

 
 
Granted
58,541

 
 
63.92

 
 
Vested
(31,660
)
 
 
55.17

 
$
1,897

Forfeited
(7,554
)
 
 
56.08

 
 
Balance as of December 31, 2016
154,832

 
 
$
59.04

 
 
Vested
(29,281
)
 
 
58.74

 
$
2,516

Forfeited
(9,062
)
 
 
60.17

 


Balance as of December 31, 2017
116,489

 
 
$
60.22

 
 
Schedule of activity related to stock options
The following table presents the activity related to stock options under all plans for the year ended December 31, 2017:
 
Stock
Options

Weighted
Average
Exercise
Price
 
 
Weighted
Average
Remaining
Contractual
Term (in years)
Aggregate
Intrinsic
Value
(in thousands)
 
Stock Options Outstanding as of January 1, 2017
478,889

 
$
45.14

 
 
 
 
   Exercised
(166,838
)
 
44.96

 
 
 
 
   Forfeited
(8,499
)
 
44.38

 
 
 
 
Stock Options Outstanding as of December 31, 2017
303,552

 
45.26

 
4.0
 
$
12,277

Stock Options Vested and Exercisable as of December 31, 2017
303,552

 
45.26

 
4.0
 
12,277
Summary of certain stock option activity of the Company
The following summarizes certain stock option activity of the Company for the years ended December 31, 2017, 2016, and 2015:
(dollars in thousands)
2017

 
 
2016

 
 
2015

Intrinsic Value of Stock Options Exercised
$
5,991

 
 
$
1,990

 
 
$
2,754

Cash Received from Stock Options Exercised
7,502

 
 
3,546

 
 
9,704

Tax Benefits Realized from Stock Options Exercised
2,003

 
 
384

 
 
330