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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Selected Financial Impact of Share-based Compensation The following is a summary of share-based compensation costs and related tax benefits recorded in our consolidated statements of income:
(in thousands)
 
For the Years Ended December 31,

 
2019
 
2018
 
2017

 
 
 
 
 
 
Share-based compensation expense included in cost of revenue
 
$
2,681

 
$
2,816

 
$
2,675

Share-based compensation expense included in operating expenses
 
36,597

 
22,341

 
20,842

Total share-based compensation expense included in consolidated statements of income
 
39,278

 
25,157

 
23,517

Income tax benefit resulting from share-based compensation expense
 
(4,861
)
 
(4,190
)
 
(6,810
)
Net share-based compensation expense included in consolidated statements of income, excluding tax benefit from settlement of share-based awards
 
34,417

 
20,967

 
16,707

Income tax benefit resulting from settlement of share-based awards
 
(19,140
)
 
(21,496
)
 
(27,743
)
Net expense (benefit) related to share-based compensation arrangements included in consolidated statements of income
 
$
15,277

 
$
(529
)
 
$
(11,036
)
Schedule of Weighted Averages of the Assumptions Used in Estimating the Fair Value of Stock Option Awards The weighted averages of the valuation assumptions used to determine the fair value of each option award on the date of grant and the weighted average estimated fair values were as follows:

 
For the Years Ended December 31,

 
2019
 
2018
 
2017

 
 

 
 

 
 

Share price at grant
 
$
218.66

 
$
179.56

 
$
142.89

Share exercise price
 
$
220.88

 
$
179.56

 
$
142.89

Expected stock price volatility
 
26
%
 
24
%
 
26
%
Expected term, in years
 
6.0

 
5.8

 
5.8

Risk-free interest rate
 
2.4
%
 
2.7
%
 
2.0
%
Weighted average fair value of options granted
 
$
65.53

 
$
52.99

 
$
40.83
Schedule of Stock Option Activity
A summary of the status of options granted under our share-based compensation plans at December 31, 2019, and changes during the year then ended, are presented in the table below:

 
Number of Options (000)
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value ($000)

 
 

 
 

 
 
 
 

Outstanding as of December 31, 2018
 
2,449

 
$
91.64

 
 
 
 
Granted
 
351

 
$
220.88

 
 
 
 
Exercised
 
(445
)
 
$
58.32

 
 
 
 
Forfeited
 
(44
)
 
$
122.23

 
 
 
 
Outstanding as of December 31, 2019
 
2,311

 
$
117.13

 
6.4
 
$
334,116

 
 
 
 
 
 
 
 
 
Fully vested as of December 31, 2019
 
1,222

 
$
83.11

 
5.4
 
$
217,569

 
 
 
 
 
 
 
 
 
Fully vested and expected to vest as of December 31, 2019
 
2,277

 
$
116.52

 
6.4
 
$
330,606
Schedule of Restricted Stock Unit Activity
A summary of the status of RSUs and PBRSUs granted under our share-based compensation plans at December 31, 2019, and changes during the period then ended, are presented in the table below:

 
Number of Units (000)
 
Weighted Average Grant-Date Fair Value

 
 

 
 

Nonvested as of December 31, 2018
 
306

 
$
113.87

Granted
 
80

 
$
209.39

Vested
 
(113
)
 
$
95.20

Forfeited
 
(15
)
 
$
134.89

Nonvested as of December 31, 2019
 
258

 
$
150.50

 
 
 
 
 
Expected to vest as of December 31, 2019
 
243

 
$
149.65