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Share-Based Compensation
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
3.
Share-Based Compensation
For the three months ended March 31, 2018 and 2017, we recorded share-based compensation and related tax benefits as follows: 
 
 
Three months ended March 31,
(Dollars in thousands)
 
2018
 
2017
Share-based compensation expense
 
$
10,523

 
$
9,203

Income tax benefit related to share-based compensation expense
 
(2,317
)
 
(3,015
)

Unrecognized Compensation Expense
As of March 31, 2018, unrecognized share-based compensation expense was as follows:
(Dollars in thousands)
 
  Unrecognized  
Expense
 
Weighted Average Expected
Recognition Period 
- in Years  
Stock options
 
$
8,290

 
2.48
Restricted stock units
 
46,036

 
2.48
Total unrecognized share-based compensation expense
 
$
54,326

 
 

Share-Based Payment Award Activity
The table below provides stock option information related to the 2006 Equity Incentive Plan for the three months ended March 31, 2018:
 
 
Options
 
Weighted
Average
 Exercise Price 
 
Weighted Average Remaining Contractual Life - in Years  
 
Aggregate
  Intrinsic Value  
of In-The-
Money
Options
Outstanding at December 31, 2017
 
808,049

 
$
105.68

 
 
 
 
Granted
 
471

 
260.72

 
 
 
 
Exercised
 
(51,271
)
 
68.05

 
 
 
 
Forfeited
 
(1,926
)
 
130.69

 
 
 
 
Outstanding at March 31, 2018
 
755,323

 
108.26

 
3.61
 
$
99,521,692

Vested and expected to vest at March 31, 2018
 
738,585

 
107.43

 
3.57
 
97,934,520

Exercisable at March 31, 2018
 
416,281

 
87.28

 
2.50
 
63,585,697


The aggregate intrinsic value of outstanding options shown in the table above represents the pre-tax intrinsic value based on our closing stock price of $240.01 as of March 31, 2018. The total intrinsic value of options exercised during the three months ended March 31, 2018 was $9.4 million, compared to $16.5 million for the comparable 2017 period.
The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the three months ended March 31, 2018:
 
 
Shares    
 
Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017
 
637,667

 
$
135.86

Granted
 
10,699

 
237.94

Vested
 
(42,171
)
 
126.23

Forfeited
 
(13,332
)
 
132.87

Nonvested at March 31, 2018
 
592,863

 
138.46