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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Costs Related to Company's Stock-Based Compensation Plan
The following costs related to the Company’s stock-based compensation plan are included in the unaudited consolidated statements of income:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
Cost of revenue
$
1,109

 
$
795

 
$
3,448

 
$
2,848

General and administrative expenses
2,601

 
1,905

 
7,541

 
6,241

Selling and marketing expenses
1,998

 
1,784

 
5,782

 
5,654

Total
$
5,708

 
$
4,484

 
$
16,771

 
$
14,743
Stock Based Compensation Stock Option Activity
Stock option activity under the Company’s stock plans is shown below:

Number of
Options
 
Weighted Avg
Exercise
Price
 
Aggregate
Intrinsic
Value
 
Weighted Avg
Remaining
Contractual
Life (Years)
Outstanding at December 31, 2016
811,902

 
$
16.31

 
$
27,718

 
2.96
  Granted
—

 
—

 
 
 
 
  Exercised
(349,880
)
 
12.22

 
 
 
 
  Forfeited
—

 
—

 
 
 
 
Outstanding at September 30, 2017
462,022

 
$
19.40

 
$
17,980

 
2.97
Vested and exercisable at September 30, 2017
462,022

 
$
19.40

 
$
17,980

 
2.97
Restricted Stock and Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activity Under Company's Stock Plans
Restricted stock and restricted stock unit activity under the Company’s stock plans is shown below:
 
Restricted Stock
 
Restricted Stock Units
 
Number
 
Weighted Avg Grant Date
Fair Value
 
Number
 
Weighted Avg Grant Date
Fair Value
Outstanding at December 31, 2016*
246,940

 
$
42.42

 
1,256,288

 
$
37.38

Granted
—

 
—

 
391,927

 
48.02

Vested
(36,767
)
 
38.74

 
(449,977
)
 
34.69

Forfeited
(4,505
)
 
35.11

 
(96,140
)
 
41.03

Outstanding at September 30, 2017*
205,668

 
$
43.24

 
1,102,098

 
$
41.94

 
 
 
 
 
*     As of September 30, 2017 and December 31, 2016 restricted stock units vested for which the underlying common stock is yet to be issued are 146,112 and 135,054, respectively.
Performance Based Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activity Under Company's Stock Plans
Performance restricted stock unit (the “PRSUs”) activity under the Company’s stock plans is shown below:
 
Revenue Based PRSUs
 
Market Condition Based PRSUs
 
Number
 
Weighted Avg Grant Date
Fair Value
 
Number
 
Weighted Avg Grant Date
Fair Value
Outstanding at December 31, 2016
115,174

 
$
41.70

 
215,171

 
$
47.42

Granted
62,113

 
47.73

 
62,100

 
54.10

Vested
—

 
—

 
—

 
—

Forfeited
(8,595
)
 
43.96

 
(8,595
)
 
59.40

Outstanding at September 30, 2017
168,692

 
$
43.81

 
268,676

 
$
48.58