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Share-based Awards (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share option activity
The following table summarizes option activity for the six months ended June 30, 2018: 
 
Options
Outstanding
Number of Shares 

 
Weighted
Average
Exercise
Price

 
Weighted
Average Grant Date
Fair Value

 
Weighted
Average
Remaining
Contractual
Life
Outstanding at December 31, 2017
1,171,393

 
$
56.02

 
$
17.15

 
 
Granted
167,557

 
$
118.90

 
$
36.84

 
 
Exercised
(226,888
)
 
$
45.58

 
$
14.59

 
 
Forfeited
(6,580
)
 
$
37.07

 
$
12.32

 
 
 
 
 
 
 
 
 
 
Outstanding at June 30, 2018
1,105,482

 
$
67.80

 
$
20.69

 
5.08
 
 
 
 
 
 
 
 
Exercisable at June 30, 2018
562,223

 
$
48.81

 
$
15.39

 
3.80
Schedule of movement in non-vested share options
The following table summarizes the movement in non-vested share options for the six months ended June 30, 2018: 
 
Options
Outstanding
Number of Shares

 
Weighted Average
Exercise Price

 
Weighted Average
Grant Date Fair Value

Non-vested outstanding at December 31, 2017
694,727

 
$
68.06

 
$
20.03

 


 


 


Granted
167,557

 
$
118.90

 
$
36.84

Vested
(316,320
)
 
$
61.76

 
$
18.41

Forfeited
(2,705
)
 
$
56.58

 
$
16.84

 


 


 


Non-vested outstanding at June 30, 2018
543,259

 
$
87.46

 
$
26.17
Schedule of weighted average fair values and assumptions used
The weighted average grant date fair values and assumptions used were as follows:
 
Six Months Ended
 
June 30, 2018

 
June 30, 2017

Weighted average grant date fair value
$
36.84

 
$
25.06

Assumptions:
 

 
 

Expected volatility
30
%
 
29
%
Dividend yield
—
%
 
—
%
Risk-free interest rate
2.73
%
 
1.93
%
Expected life
5 years

 
5 years
Schedule of RSU and PSU activity
The following table summarizes RSU and PSU activity for the six months ended June 30, 2018:
 
 
PSU
Outstanding
Number of
Shares

 
 
PSU
Weighted
Average Grant Date
Fair Value

 
PSU
Weighted
Average
Remaining
Contractual
Life
 
 
RSU
Outstanding
Number of
Shares

 
 
RSU
Weighted
Average Grant Date
Fair Value

 
RSU
Weighted
Average
Remaining
Contractual
Life
Outstanding at December 31, 2017
511,026

 
$
72.07

 
0.93
 
715,970

 
$
72.65

 
1.28
 
 
 
 
 
 
 
 
 
 
 
 
Granted
71,906

 
$
116.02

 
 
 
158,775

 
$
123.27

 
 
Shares vested
(215,826
)
 
$
68.28

 
 
 
(270,362
)
 
$
67.92

 
 
Forfeited
(116,053
)
 
$
70.89

 
 
 
(34,044
)
 
$
74.45

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at June 30, 2018
251,053

 
$
85.95

 
1.47
 
570,339

 
$
88.88

 
1.70
Schedule of non-cash stock compensation expense
Non-cash stock compensation expense for the three and six months ended June 30, 2018 has been allocated as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2018

 
June 30, 2017

 
June 30, 2018

 
June 30, 2017

 
(in thousands)
 
(in thousands)
Direct costs
$
3,878

 
$
5,450

 
$
9,053

 
$
10,304

Selling, general and administrative
3,160

 
4,442

 
7,377

 
8,397

 
 
 
 
 


 


 
$
7,038

 
$
9,892

 
$
16,430

 
$
18,701